feat[venom]: common subexpression elimination pass

[HodanPlodky]

What I did

Created common subexpression elimination pass

How I did it

Created available expression analysis and common subexpressions elimination pass. The available expression analysis is done with consideration to effects which heavy inspired by multidimensional fencing.

How to verify it

Created tests

Commit message

feat[venom]: common subexpression elimination

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[charles-cooper]

looks like this can be IROperand | _Expression

[codecov]

Codecov Report

Attention: Patch coverage is 93.70861% with 19 lines in your changes missing coverage. Please review.

Project coverage is 92.12%. Comparing base (015868a) to head (32384f1).

Files with missing lines	Patch %	Lines
vyper/venom/analysis/available_expression.py	93.08%	15 Missing and 2 partials ⚠️
...r/venom/passes/common_subexpression_elimination.py	95.55%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4241      +/-   ##
==========================================
+ Coverage   92.09%   92.12%   +0.02%     
==========================================
  Files         119      121       +2     
  Lines       16931    17233     +302     
  Branches     2865     2936      +71     
==========================================
+ Hits        15593    15876     +283     
- Misses        919      935      +16     
- Partials      419      422       +3     

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