Finish SQL functions refactoring

[dreadatour]

WIP: need to cleanup the code and fix all the tests. Description will be updated.

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[codecov]

Codecov Report

Attention: Patch coverage is 80.05952% with 67 lines in your changes missing coverage. Please review.

Project coverage is 87.05%. Comparing base (529c297) to head (26fb69c).

Files with missing lines	Patch %	Lines
src/datachain/lib/func/func.py	64.03%	35 Missing and 6 partials ⚠️
src/datachain/lib/func/string.py	74.28%	6 Missing and 3 partials ⚠️
src/datachain/lib/dc.py	78.94%	4 Missing and 4 partials ⚠️
src/datachain/lib/func/array.py	85.00%	6 Missing ⚠️
src/datachain/cli.py	0.00%	1 Missing ⚠️
src/datachain/client/fsspec.py	83.33%	0 Missing and 1 partial ⚠️
src/datachain/lib/func/inner/base.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #543      +/-   ##
==========================================
- Coverage   87.37%   87.05%   -0.33%     
==========================================
  Files          97      102       +5     
  Lines       10178    10410     +232     
  Branches     1391     1437      +46     
==========================================
+ Hits         8893     9062     +169     
- Misses        922      974      +52     
- Partials      363      374      +11     

Flag	Coverage Δ
datachain	86.99% <80.05%> (-0.33%)	⬇️

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