Implement Intl.PluralRules

[jedel1043]

This Pull Request implements the Intl.PluralRules service. It also implements some number formatting tools that will be useful when we eventually implement Intl.NumberFormat.

Intl.PluralRules.prototype.selectRange needs support from ICU4X first, but I'm in charge of it and I'll try to finish it soon™. You can track its progress on unicode-org/icu4x#3012.

[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	95,574	95,574	0
Passed	75,084	75,156	+72
Ignored	19,494	19,494	0
Failed	996	924	-72
Panics	0	0	0
Conformance	78.56%	78.64%	+0.08%

Fixed tests (72):

test/intl402/PluralRules/name.js [strict mode] (previously Failed)
test/intl402/PluralRules/name.js (previously Failed)
test/intl402/PluralRules/builtin.js [strict mode] (previously Failed)
test/intl402/PluralRules/builtin.js (previously Failed)
test/intl402/PluralRules/prop-desc.js [strict mode] (previously Failed)
test/intl402/PluralRules/prop-desc.js (previously Failed)
test/intl402/PluralRules/proto-from-ctor-realm.js [strict mode] (previously Failed)
test/intl402/PluralRules/proto-from-ctor-realm.js (previously Failed)
test/intl402/PluralRules/constructor-options-throwing-getters.js [strict mode] (previously Failed)
test/intl402/PluralRules/constructor-options-throwing-getters.js (previously Failed)
test/intl402/PluralRules/length.js [strict mode] (previously Failed)
test/intl402/PluralRules/length.js (previously Failed)
test/intl402/PluralRules/can-be-subclassed.js [strict mode] (previously Failed)
test/intl402/PluralRules/can-be-subclassed.js (previously Failed)
test/intl402/PluralRules/default-options-object-prototype.js [strict mode] (previously Failed)
test/intl402/PluralRules/default-options-object-prototype.js (previously Failed)
test/intl402/PluralRules/internals.js [strict mode] (previously Failed)
test/intl402/PluralRules/internals.js (previously Failed)
test/intl402/PluralRules/prototype/builtins.js [strict mode] (previously Failed)
test/intl402/PluralRules/prototype/builtins.js (previously Failed)
test/intl402/PluralRules/prototype/bind.js [strict mode] (previously Failed)
test/intl402/PluralRules/prototype/bind.js (previously Failed)
test/intl402/PluralRules/prototype/properties.js [strict mode] (previously Failed)
test/intl402/PluralRules/prototype/properties.js (previously Failed)
test/intl402/PluralRules/prototype/select/name.js [strict mode] (previously Failed)
test/intl402/PluralRules/prototype/select/name.js (previously Failed)
test/intl402/PluralRules/prototype/select/prop-desc.js [strict mode] (previously Failed)
test/intl402/PluralRules/prototype/select/prop-desc.js (previously Failed)
test/intl402/PluralRules/prototype/select/length.js [strict mode] (previously Failed)
test/intl402/PluralRules/prototype/select/length.js (previously Failed)
test/intl402/PluralRules/prototype/select/non-finite.js [strict mode] (previously Failed)
test/intl402/PluralRules/prototype/select/non-finite.js (previously Failed)
test/intl402/PluralRules/prototype/select/tainting.js [strict mode] (previously Failed)
test/intl402/PluralRules/prototype/select/tainting.js (previously Failed)
test/intl402/PluralRules/prototype/toStringTag/toString-removed-tag.js [strict mode] (previously Failed)
test/intl402/PluralRules/prototype/toStringTag/toString-removed-tag.js (previously Failed)
test/intl402/PluralRules/prototype/toStringTag/toString-changed-tag.js [strict mode] (previously Failed)
test/intl402/PluralRules/prototype/toStringTag/toString-changed-tag.js (previously Failed)
test/intl402/PluralRules/prototype/toStringTag/toStringTag.js [strict mode] (previously Failed)
test/intl402/PluralRules/prototype/toStringTag/toStringTag.js (previously Failed)
test/intl402/PluralRules/prototype/toStringTag/toString.js [strict mode] (previously Failed)
test/intl402/PluralRules/prototype/toStringTag/toString.js (previously Failed)
test/intl402/PluralRules/prototype/constructor/prop-desc.js [strict mode] (previously Failed)
test/intl402/PluralRules/prototype/constructor/prop-desc.js (previously Failed)
test/intl402/PluralRules/prototype/constructor/main.js [strict mode] (previously Failed)
test/intl402/PluralRules/prototype/constructor/main.js (previously Failed)
test/intl402/PluralRules/prototype/resolvedOptions/name.js [strict mode] (previously Failed)
test/intl402/PluralRules/prototype/resolvedOptions/name.js (previously Failed)
test/intl402/PluralRules/prototype/resolvedOptions/order.js [strict mode] (previously Failed)
test/intl402/PluralRules/prototype/resolvedOptions/order.js (previously Failed)
test/intl402/PluralRules/prototype/resolvedOptions/pluralCategories.js [strict mode] (previously Failed)
test/intl402/PluralRules/prototype/resolvedOptions/pluralCategories.js (previously Failed)
test/intl402/PluralRules/prototype/resolvedOptions/prop-desc.js [strict mode] (previously Failed)
test/intl402/PluralRules/prototype/resolvedOptions/prop-desc.js (previously Failed)
test/intl402/PluralRules/prototype/resolvedOptions/builtins.js [strict mode] (previously Failed)
test/intl402/PluralRules/prototype/resolvedOptions/builtins.js (previously Failed)
test/intl402/PluralRules/prototype/resolvedOptions/length.js [strict mode] (previously Failed)
test/intl402/PluralRules/prototype/resolvedOptions/length.js (previously Failed)
test/intl402/PluralRules/prototype/resolvedOptions/properties.js [strict mode] (previously Failed)
test/intl402/PluralRules/prototype/resolvedOptions/properties.js (previously Failed)
test/intl402/PluralRules/supportedLocalesOf/name.js [strict mode] (previously Failed)
test/intl402/PluralRules/supportedLocalesOf/name.js (previously Failed)
test/intl402/PluralRules/supportedLocalesOf/arguments.js [strict mode] (previously Failed)
test/intl402/PluralRules/supportedLocalesOf/arguments.js (previously Failed)
test/intl402/PluralRules/supportedLocalesOf/prop-desc.js [strict mode] (previously Failed)
test/intl402/PluralRules/supportedLocalesOf/prop-desc.js (previously Failed)
test/intl402/PluralRules/supportedLocalesOf/length.js [strict mode] (previously Failed)
test/intl402/PluralRules/supportedLocalesOf/length.js (previously Failed)
test/intl402/PluralRules/supportedLocalesOf/main.js [strict mode] (previously Failed)
test/intl402/PluralRules/supportedLocalesOf/main.js (previously Failed)
test/intl402/PluralRules/supportedLocalesOf/supportedLocalesOf.js [strict mode] (previously Failed)
test/intl402/PluralRules/supportedLocalesOf/supportedLocalesOf.js (previously Failed)

[codecov]

Codecov Report

Patch coverage: 4.46% and project coverage change: -0.41% ⚠️

Comparison is base (7e18da6) 50.21% compared to head (bb29381) 49.80%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3298      +/-   ##
==========================================
- Coverage   50.21%   49.80%   -0.41%     
==========================================
  Files         436      441       +5     
  Lines       42691    43078     +387     
==========================================
+ Hits        21438    21456      +18     
- Misses      21253    21622     +369     

Files Changed	Coverage Δ
boa_engine/src/builtins/intl/collator/mod.rs	5.55% <ø> (ø)
boa_engine/src/builtins/intl/collator/options.rs	0.00% <0.00%> (ø)
boa_engine/src/builtins/intl/date_time_format.rs	3.06% <ø> (ø)
boa_engine/src/builtins/intl/list_format/mod.rs	5.66% <ø> (ø)
...oa_engine/src/builtins/intl/list_format/options.rs	0.00% <ø> (ø)
boa_engine/src/builtins/intl/locale/mod.rs	19.52% <ø> (ø)
boa_engine/src/builtins/intl/locale/options.rs	0.00% <ø> (ø)
boa_engine/src/builtins/intl/locale/utils.rs	52.77% <ø> (ø)
..._engine/src/builtins/intl/number_format/options.rs	0.00% <0.00%> (ø)
...oa_engine/src/builtins/intl/number_format/utils.rs	0.00% <0.00%> (ø)
... and 11 more

... and 1 file with indirect coverage changes

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[nekevss]

Most of this is looking good to me, but there's some observations I had re: ecma402 and temporal/intl shared concepts.

[nekevss]

Overall looks good to me 😄 nice work! I had one nit, but I'd be fine with merging either way.

[HalidOdat]

Nice work! Looks great to me! :)