Evaluate all parts of class in strict mode

[HalidOdat]

11.2.2 Strict Mode Code

• All parts of a ClassDeclaration or a ClassExpression are strict mode code.

[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	95,574	95,574	0
Passed	75,341	75,342	+1
Ignored	19,482	19,482	0
Failed	751	750	-1
Panics	0	0	0
Conformance	78.83%	78.83%	+0.00%

Fixed tests (1):

test/language/statements/class/strict-mode/arguments-callee.js (previously Failed)

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (f438ffa) 46.05% compared to head (4664c91) 46.06%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3383   +/-   ##
=======================================
  Coverage   46.05%   46.06%           
=======================================
  Files         474      474           
  Lines       48737    48740    +3     
=======================================
+ Hits        22447    22450    +3     
  Misses      26290    26290           

Files	Coverage Δ
boa_engine/src/bytecompiler/class.rs	15.67% <100.00%> (+0.63%)	⬆️

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