Added DataChain.storage_switch() method

[ilongin]

Added DataChain.storage_switch() method to update source column with new storage value (e.g different s3 bucket).
Optionally old_storage argument can be passed so only those rows with old_storage values are updated which can be convenient when dataset has multiple sources and we only want to update one of those.

TODO:

• Reset version, etag, last_modified and size
• Create new method called bucket_update() to update version, etag, last_modified

[cloudflare-workers-and-pages]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.17%. Comparing base (95c95f7) to head (9ccc536).
Report is 62 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1037   +/-   ##
=======================================
  Coverage   88.16%   88.17%           
=======================================
  Files         145      145           
  Lines       12379    12386    +7     
  Branches     1719     1720    +1     
=======================================
+ Hits        10914    10921    +7     
  Misses       1046     1046           
  Partials      419      419           

Flag	Coverage Δ
datachain	88.09% <100.00%> (+<0.01%)	⬆️

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[shcheklein]

Closing for now ...