Remove double indirection in module types

[jedel1043]

Should improve cache locality + allows allocating the whole Module struct in a single Gc.

[codecov]

Codecov Report

Attention: 308 lines in your changes are missing coverage. Please review.

Comparison is base (dc1c484) 47.27% compared to head (a19bb58) 47.30%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
core/engine/src/module/source.rs	0.00%	224 Missing ⚠️
core/engine/src/module/synthetic.rs	0.00%	56 Missing ⚠️
core/engine/src/module/mod.rs	0.00%	25 Missing ⚠️
core/gc/src/trace.rs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3640      +/-   ##
==========================================
+ Coverage   47.27%   47.30%   +0.02%     
==========================================
  Files         476      476              
  Lines       46798    46834      +36     
==========================================
+ Hits        22123    22153      +30     
- Misses      24675    24681       +6     

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[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	96,310	96,310	0
Passed	80,280	80,280	0
Ignored	4,217	4,217	0
Failed	11,813	11,813	0
Panics	0	0	0
Conformance	83.36%	83.36%	0.00%

[HalidOdat]

Nice change! Looks good to me! :)

[raskad]

Nice work