add support for iceberg import

[skshetry]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 35.29412% with 22 lines in your changes missing coverage. Please review.

Project coverage is 87.51%. Comparing base (ca27757) to head (a20ab13).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/datachain/lib/dc.py	17.39%	18 Missing and 1 partial ⚠️
src/datachain/lib/arrow.py	0.00%	1 Missing and 1 partial ⚠️
src/datachain/utils.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #937      +/-   ##
==========================================
- Coverage   87.65%   87.51%   -0.15%     
==========================================
  Files         131      131              
  Lines       11896    11927      +31     
  Branches     1622     1624       +2     
==========================================
+ Hits        10428    10438      +10     
- Misses       1058     1078      +20     
- Partials      410      411       +1     

Flag	Coverage Δ
datachain	87.44% <35.29%> (-0.15%)	⬇️

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