Remove the boa_interop module

[hansl]

Move the useful loaders into boa_engine, and the tests into boa_macros_tests.

Closes #3905

[codecov]

Codecov Report

❌ Patch coverage is 77.27273% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 50.83%. Comparing base (6ddc2b4) to head (5385a21).
⚠️ Report is 519 commits behind head on main.

Files with missing lines	Patch %	Lines
core/engine/src/module/loader/mod.rs	73.68%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4407      +/-   ##
==========================================
+ Coverage   47.24%   50.83%   +3.58%     
==========================================
  Files         476      501      +25     
  Lines       46892    51192    +4300     
==========================================
+ Hits        22154    26023    +3869     
- Misses      24738    25169     +431     

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[nekevss]

We will need to remember to update boa_interop as deprecated in our documentation.

[nekevss]

Looks good

Note: this should close #3905

Also, I'm slightly curious if it's worth having a "crate graveyard" for deprecated crates that is outside of core.

[hansl]

@nekevss Once the release is done, I'll actually remove this crate from our repo. I don't know about a graveyard.