fix(expr): null input of ~ / !~

[xiangjinwu]

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What's changed and what's your intention?

Fixes #5136

We used to rewrite a ~ b to regexp_match(a, b) is not null in frontend. This works in most cases except when either a or b is null, where the former is expected to return null but the rewritten form returns false. Thanks to prebuild of function macro, we can now support a native ~ implementation without rewriting.

Checklist

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
• I have added fuzzing tests or opened an issue to track them. (Optional, recommended for new SQL features Sqlsmith: Sql feature generation #7934).
• My PR contains breaking changes. (If it deprecates some features, please create a tracking issue to remove them in the future).
• All checks passed in ./risedev check (or alias, ./risedev c)
• My PR changes performance-critical code. (Please run macro/micro-benchmarks and show the results.)

• My PR contains critical fixes that are necessary to be merged into the latest release. (Please check out the details)

Documentation

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Release note

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[yezizp2012]

LGTM

[codecov]

Codecov Report

Merging #13145 (cb50793) into main (e392db0) will increase coverage by 0.00%.
Report is 2 commits behind head on main.
The diff coverage is 54.54%.

@@           Coverage Diff           @@
##             main   #13145   +/-   ##
=======================================
  Coverage   68.24%   68.25%           
=======================================
  Files        1500     1500           
  Lines      252692   252699    +7     
=======================================
+ Hits       172448   172470   +22     
+ Misses      80244    80229   -15     

Flag	Coverage Δ
rust	68.25% <54.54%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
src/frontend/src/expr/pure.rs	87.69% <ø> (ø)
src/frontend/src/binder/expr/binary_op.rs	71.13% <66.66%> (+0.72%)	⬆️
src/expr/impl/src/scalar/regexp.rs	14.20% <50.00%> (+0.79%)	⬆️

... and 5 files with indirect coverage changes

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