File() and UDF refactoring

[rlamy]

Fixes #34 and #35

[codecov]

Codecov Report

Attention: Patch coverage is 90.09009% with 11 lines in your changes missing coverage. Please review.

Project coverage is 84.00%. Comparing base (6c0fdba) to head (d821b45).

Files	Patch %	Lines
src/datachain/lib/udf.py	88.00%	2 Missing and 4 partials ⚠️
src/datachain/lib/file.py	86.36%	2 Missing and 1 partial ⚠️
src/datachain/query/udf.py	90.90%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
- Coverage   84.03%   84.00%   -0.04%     
==========================================
  Files          91       90       -1     
  Lines        9406     9413       +7     
  Branches     1849     1858       +9     
==========================================
+ Hits         7904     7907       +3     
- Misses       1178     1179       +1     
- Partials      324      327       +3     

Flag	Coverage Δ
datachain	83.93% <90.09%> (-0.04%)	⬇️

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[dmpetrov]

Looks good at the lib level. However, I'm not bit an expert in the query/udf.
PLease feel free to merge when it's ready.

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[dreadatour]

Code looks good to me! 👍
Approving it because it looks solid and I suppose it has been tested well.
I wish I have much more time to dive into all the details and test all the changes.