Add an embed_module!() macro to boa_interop

[hansl]

The macro creates a ModuleLoader that includes all JS files from a directory.

[codecov]

Codecov Report

Attention: Patch coverage is 32.97872% with 63 lines in your changes are missing coverage. Please review.

Project coverage is 50.26%. Comparing base (6ddc2b4) to head (3eb5eeb).
Report is 137 commits behind head on main.

❗ Current head 3eb5eeb differs from pull request most recent head f2ba245. Consider uploading reports for the commit f2ba245 to get more accurate results

Files	Patch %	Lines
core/macros/src/embedded_module_loader.rs	0.00%	49 Missing ⚠️
core/interop/src/loaders/embedded.rs	70.00%	12 Missing ⚠️
core/macros/src/lib.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3784      +/-   ##
==========================================
+ Coverage   47.24%   50.26%   +3.01%     
==========================================
  Files         476      461      -15     
  Lines       46892    45058    -1834     
==========================================
+ Hits        22154    22647     +493     
+ Misses      24738    22411    -2327     

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[hansl]

@jedel1043 this would be ready for review. My use case for this is to have a build process which uses parcel, then embedding the resulting dist folder in the executable.

[jedel1043]

LGTM, just needs to appease clippy.

[nekevss]

LGTM :)