[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

Merging #2282 (3532dcb) into testnet3 (c8f6089) will increase coverage by 0.12%.
The diff coverage is 78.70%.

@@             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     

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/ast/src/passes/consumer.rs	89.28% <ø> (+0.39%)	⬆️
compiler/ast/src/passes/visitor.rs	87.50% <ø> (-0.74%)	⬇️
compiler/compiler/src/compiler.rs	86.66% <ø> (ø)
compiler/ast/src/passes/reconstructor.rs	67.66% <66.66%> (-1.00%)	⬇️
... and 25 more

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