feat(cubesql): Top-down extractor for rewrites

[MazterQyou]

Check List

• Tests has been run in packages where changes made if available
• Linter has been run for changed code
• Tests for the changes have been added if not covered yet
• Docs have been added / updated if required

Description of Changes Made

This PR adds a top-down extractor for e-graphs in addition to the previously used bottom-up extractor. This allows extracting nodes from e-classes with respect to their state. Use flag CUBESQL_TOP_DOWN_EXTRACTOR=true to enable.

[codecov]

Codecov Report

Attention: Patch coverage is 87.84404% with 53 lines in your changes missing coverage. Please review.

Project coverage is 82.61%. Comparing base (2bb9aa3) to head (157ad9f).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
rust/cubesql/cubesql/src/compile/rewrite/cost.rs	88.03%	42 Missing ⚠️
...st/cubesql/cubesql/src/compile/rewrite/rewriter.rs	66.66%	8 Missing ⚠️
rust/cubesql/cubesql/src/compile/mod.rs	93.75%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8694      +/-   ##
==========================================
- Coverage   82.67%   82.61%   -0.07%     
==========================================
  Files         217      217              
  Lines       78125    78399     +274     
==========================================
+ Hits        64588    64767     +179     
- Misses      13537    13632      +95     

Flag	Coverage Δ
cubesql	82.61% <87.84%> (-0.07%)	⬇️

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