Unify generator and ordinary function creation

[HalidOdat]

Depends on #3440

Continuation of the refactor, split into smaller PRs for easier review :)

It changes the following:

• Add flag to CodeBlockFlags::HAS_PROROTYPE_PROPERTY which arrow and object method functions don't have.
• Remove GetGenerator and GetArrowFunction
• Removes GetFunction is_method: bool operand
• Remove create_generator_function_object() function.
• Unify generator and ordinary function creation
• Removes AsyncGeneratorFunction and GeneratorFunction ObjectKinds since we already have the kind stored in the CodeBlock as a bitflag

[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	95,609	95,609	0
Passed	75,978	75,978	0
Ignored	18,872	18,872	0
Failed	759	759	0
Panics	0	0	0
Conformance	79.47%	79.47%	0.00%

[codecov]

Codecov Report

Attention: 46 lines in your changes are missing coverage. Please review.

Comparison is base (b4644a5) 45.45% compared to head (ad589c1) 45.50%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3441      +/-   ##
==========================================
+ Coverage   45.45%   45.50%   +0.04%     
==========================================
  Files         483      482       -1     
  Lines       49715    49591     -124     
==========================================
- Hits        22599    22565      -34     
+ Misses      27116    27026      -90     

Files	Coverage Δ
boa_engine/src/bytecompiler/function.rs	100.00% <100.00%> (ø)
boa_engine/src/object/mod.rs	28.70% <100.00%> (-0.27%)	⬇️
boa_engine/src/vm/mod.rs	56.37% <ø> (ø)
boa_engine/src/vm/opcode/mod.rs	5.00% <ø> (ø)
boa_engine/src/bytecompiler/mod.rs	68.03% <75.00%> (+0.43%)	⬆️
boa_engine/src/vm/flowgraph/mod.rs	0.00% <0.00%> (ø)
boa_engine/src/bytecompiler/declarations.rs	52.42% <33.33%> (+0.52%)	⬆️
boa_engine/src/context/intrinsics.rs	97.15% <75.00%> (-0.47%)	⬇️
boa_engine/src/vm/opcode/get/function.rs	57.14% <60.00%> (+2.30%)	⬆️
boa_engine/src/module/source.rs	0.00% <0.00%> (ø)
... and 3 more

... and 3 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[raskad]

Great refactor too!

[jedel1043]

Really nice to see the red line count go up :D