[Refactor] Use the Consumer pattern for code generation.

[d0cd]

This PR,

• Removes AssociatedConstants from the AST
• Refactors the Visitor, Reconstructor, and Consumer traits.
• Refactors the code generation pass to use the Consumer.

[codecov]

Codecov Report

❌ Patch coverage is 78.70036% with 59 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.06%. Comparing base (c8f6089) to head (3532dcb).
⚠️ Report is 1216 commits behind head on testnet3.

Files with missing lines	Patch %	Lines
.../passes/src/code_generation/generate_statements.rs	68.96%	18 Missing ⚠️
...ler/passes/src/code_generation/generate_program.rs	78.94%	12 Missing ⚠️
...iler/passes/src/type_checking/check_expressions.rs	76.47%	12 Missing ⚠️
compiler/ast/src/passes/reconstructor.rs	66.66%	6 Missing ⚠️
compiler/passes/src/code_generation/generator.rs	76.47%	4 Missing ⚠️
...passes/src/code_generation/generate_expressions.rs	90.00%	3 Missing ⚠️
.../src/static_single_assignment/rename_expression.rs	89.28%	3 Missing ⚠️
...mpiler/passes/src/flattening/flatten_expression.rs	87.50%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           testnet3    #2282      +/-   ##
============================================
+ Coverage     77.94%   78.06%   +0.12%     
============================================
  Files           150      148       -2     
  Lines          4571     4619      +48     
  Branches       4569     4617      +48     
============================================
+ Hits           3563     3606      +43     
- Misses         1008     1013       +5     

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[d0cd]

Closing due to inactivity.