670 Add debug information per file

[ghaith]

Debug information is now added per file, and not for the entire module
This allows multiple file definitions even through the same LLVM Module

[codecov-commenter]

Codecov Report

Base: 94.19% // Head: 94.22% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (635685d) compared to base (78a9d44).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 635685d differs from pull request most recent head 7cff906. Consider uploading reports for the commit 7cff906 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #687      +/-   ##
==========================================
+ Coverage   94.19%   94.22%   +0.03%     
==========================================
  Files          46       46              
  Lines       18785    18907     +122     
==========================================
+ Hits        17694    17816     +122     
  Misses       1091     1091              

Impacted Files	Coverage Δ
src/index/symbol.rs	95.34% <ø> (ø)
src/ast.rs	96.21% <100.00%> (ø)
src/codegen.rs	99.31% <100.00%> (ø)
src/codegen/debug.rs	94.68% <100.00%> (+0.55%)	⬆️
src/codegen/generators/variable_generator.rs	94.17% <100.00%> (+0.05%)	⬆️
src/diagnostics.rs	82.39% <100.00%> (ø)
src/lib.rs	87.75% <100.00%> (+0.01%)	⬆️
src/test_utils.rs	96.93% <100.00%> (+0.01%)	⬆️
src/tests/external_files.rs	98.86% <100.00%> (+0.04%)	⬆️
src/tests/multi_files.rs	100.00% <100.00%> (ø)
... and 4 more

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