Add pre-validation checks to PyValidator

[giladchase]

Python: https://github.com/starkware-industries/starkware/pull/32481

This change is 

[codecov-commenter]

Codecov Report

Merging #1100 (3df0a3d) into gilad/reconnect-native-blockifier (f9174a9) will decrease coverage by 0.29%.
The diff coverage is 0.00%.

@@                          Coverage Diff                          @@
##           gilad/reconnect-native-blockifier    #1100      +/-   ##
=====================================================================
- Coverage                              67.58%   67.29%   -0.29%     
=====================================================================
  Files                                     51       51              
  Lines                                   6501     6529      +28     
  Branches                                6501     6529      +28     
=====================================================================
  Hits                                    4394     4394              
- Misses                                  1723     1751      +28     
  Partials                                 384      384              

Files	Coverage Δ
crates/native_blockifier/src/py_validator.rs	0.00% <0.00%> (ø)

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