Split compiler into multiple passes

[SirLynix]

• Split SanitizeVisitor into multiple passes
• AST is no longer cloned everytime it's processed, instead it's transformed in place and cloned beforehand.
• Access to a struct field is no longer expressed as an AccessIndexExpression but using the new AccessFieldExpression
• Backend (writers) interface have been changed a lot

[codecov]

Codecov Report

Attention: Patch coverage is 77.14953% with 978 lines in your changes missing coverage. Please review.

Project coverage is 76.65%. Comparing base (d6aa156) to head (beff6f5).
Report is 61 commits behind head on main.

Files with missing lines	Patch %	Lines
...NZSL/Ast/Transformations/ValidationTransformer.cpp	67.43%	468 Missing ⚠️
src/NZSL/Ast/Transformations/Transformer.cpp	86.38%	70 Missing ⚠️
src/CNZSL/BackendParameters.cpp	0.00%	63 Missing ⚠️
src/NZSL/Ast/IndexRemapperVisitor.cpp	72.41%	56 Missing ⚠️
src/NZSL/SpirV/SpirvExpressionLoad.cpp	57.00%	46 Missing ⚠️
...Transformations/ConstantPropagationTransformer.cpp	68.54%	39 Missing ⚠️
src/NZSL/Ast/Utils.cpp	71.02%	31 Missing ⚠️
...Ast/Transformations/EliminateUnusedTransformer.cpp	82.65%	17 Missing ⚠️
...Ast/Transformations/ConstantRemovalTransformer.cpp	80.51%	15 Missing ⚠️
...st/Transformations/StructAssignmentTransformer.cpp	87.90%	15 Missing ⚠️
... and 33 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #64      +/-   ##
==========================================
- Coverage   77.11%   76.65%   -0.47%     
==========================================
  Files         159      185      +26     
  Lines       21656    23343    +1687     
  Branches     6456     7041     +585     
==========================================
+ Hits        16701    17894    +1193     
- Misses       4853     5351     +498     
+ Partials      102       98       -4     

Files with missing lines	Coverage Δ
include/NZSL/Ast/AstSerializer.hpp	100.00% <ø> (ø)
include/NZSL/Ast/Cloner.hpp	100.00% <ø> (ø)
include/NZSL/Ast/Cloner.inl	100.00% <100.00%> (ø)
include/NZSL/Ast/ConstantValue.inl	93.33% <ø> (-3.22%)	⬇️
include/NZSL/Ast/ExpressionType.hpp	95.83% <ø> (+4.16%)	⬆️
include/NZSL/Ast/ExpressionValue.hpp	100.00% <ø> (ø)
include/NZSL/Ast/IndexRemapperVisitor.hpp	100.00% <ø> (ø)
include/NZSL/Ast/IndexRemapperVisitor.inl	100.00% <100.00%> (ø)
include/NZSL/Ast/NodeList.hpp	91.11% <100.00%> (+0.20%)	⬆️
include/NZSL/Ast/Nodes.hpp	45.45% <ø> (ø)
... and 99 more

... and 2 files with indirect coverage changes

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