[executors] feat: add support for custom pre/post processors

[AndreyMarkinPPC]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 62.96296% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.03%. Comparing base (5ebb9d2) to head (c31238f).
⚠️ Report is 53 commits behind head on main.

Files with missing lines	Patch %	Lines
libs/executors/garf_executors/executor.py	44.44%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #234      +/-   ##
==========================================
+ Coverage   88.23%   89.03%   +0.80%     
==========================================
  Files          61       67       +6     
  Lines        2600     3055     +455     
==========================================
+ Hits         2294     2720     +426     
- Misses        306      335      +29     

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