refactor[venom]: use venom pass instances

[harkal]

What I did

I made the pass "manager" to work with instances instead of classes

How I did it

Updated tha pass handling code, the pass usage code, and the related tests.

How to verify it

Commit message

future venom passes that are currently under development require that
the pass manager works with pass instances rather than classes. this is
a common change that should be merged upstream in order to carry around
less changes to future pull requests.

Description for the changelog

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 90.92%. Comparing base (e34ca9c) to head (6fb76e2).

Files	Patch %	Lines
vyper/venom/passes/base_pass.py	66.66%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3908      +/-   ##
==========================================
- Coverage   90.92%   90.92%   -0.01%     
==========================================
  Files          95       95              
  Lines       14387    14386       -1     
  Branches     3186     3185       -1     
==========================================
- Hits        13081    13080       -1     
  Misses        904      904              
  Partials      402      402              

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