refactor(blockifier_reexecution): move offline reader to separate file

[aner-starkware]

No description provided.

[reviewable-StarkWare]

This change is 

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 156 lines in your changes missing coverage. Please review.

Project coverage is 41.48%. Comparing base (e3165c4) to head (4bd767f).
Report is 622 commits behind head on main.

Files with missing lines	Patch %	Lines
...execution/src/state_reader/offline_state_reader.rs	0.00%	155 Missing ⚠️
...s/blockifier_reexecution/src/state_reader/utils.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2312      +/-   ##
==========================================
+ Coverage   40.10%   41.48%   +1.37%     
==========================================
  Files          26      206     +180     
  Lines        1895    24172   +22277     
  Branches     1895    24172   +22277     
==========================================
+ Hits          760    10027    +9267     
- Misses       1100    13677   +12577     
- Partials       35      468     +433     

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[dorimedini-starkware]

Reviewed 8 of 8 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @AvivYossef-starkware)