Removing SQLAlchemy from DataChain.compare()

[ilongin]

Removing SQLAlchemy constructs from compare() function.

TODO:

• Remove or_ when Adding explicit or_ function #894 is done

[cloudflare-workers-and-pages]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.69%. Comparing base (b275928) to head (e2a3257).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #881      +/-   ##
==========================================
- Coverage   87.72%   87.69%   -0.04%     
==========================================
  Files         129      129              
  Lines       11475    11457      -18     
  Branches     1545     1544       -1     
==========================================
- Hits        10067    10047      -20     
- Misses       1020     1021       +1     
- Partials      388      389       +1     

Flag	Coverage Δ
datachain	87.61% <100.00%> (-0.04%)	⬇️

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