[Refactor] Use the Visitor pattern for code generation.

[d0cd]

This PR,

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

[codecov]

Codecov Report

Merging #2281 (dbfe07b) into testnet3 (c8f6089) will increase coverage by 0.32%.
The diff coverage is 81.35%.

@@             Coverage Diff              @@
##           testnet3    #2281      +/-   ##
============================================
+ Coverage     77.94%   78.27%   +0.32%     
============================================
  Files           150      149       -1     
  Lines          4571     4571              
  Branches       4569     4569              
============================================
+ Hits           3563     3578      +15     
+ Misses         1008      993      -15     

Impacted Files	Coverage Δ
...c/expressions/access/associated_function_access.rs	50.00% <ø> (ø)
...mpiler/ast/src/expressions/access/member_access.rs	50.00% <ø> (ø)
compiler/ast/src/expressions/access/mod.rs	57.14% <ø> (ø)
...ompiler/ast/src/expressions/access/tuple_access.rs	100.00% <ø> (ø)
compiler/ast/src/expressions/mod.rs	50.00% <ø> (ø)
compiler/ast/src/lib.rs	78.37% <ø> (ø)
compiler/passes/src/code_generation/mod.rs	100.00% <ø> (ø)
.../src/static_single_assignment/rename_expression.rs	94.54% <ø> (+0.85%)	⬆️
...mpiler/passes/src/symbol_table_creation/creator.rs	87.50% <ø> (ø)
compiler/passes/src/type_checking/check_program.rs	89.14% <ø> (ø)
... and 24 more

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[d0cd]

Closing in favor of #2282