Refactor Client.parse_url()

[ilongin]

Refactoring Client.parse_url() into two methods:

1. def parse_url(source: str) -> tuple[StorageURI, str]: -> just splits source into storage uri and relative path and doesn't return Client instance any more.
2. def get_client(source: str, cache: DataChainCache, **kwargs) -> "Client": -> returns Client instance

This is done because in most of the places we were using old .parse_url() to split URL and didn't care about Client instance, but because Client instance was returned, some additional args like cache were needed.

Now we can use simpler merhod .parse_url() where we just need storage uri and path and .get_client() where actual Client instance is needed

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[codecov]

Codecov Report

Attention: Patch coverage is 97.14286% with 1 line in your changes missing coverage. Please review.

Project coverage is 87.27%. Comparing base (944defc) to head (8b4c994).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/datachain/catalog/catalog.py	94.11%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #435   +/-   ##
=======================================
  Coverage   87.27%   87.27%           
=======================================
  Files          92       92           
  Lines        9954     9955    +1     
  Branches     2048     2049    +1     
=======================================
+ Hits         8687     8688    +1     
  Misses        913      913           
  Partials      354      354           

Flag	Coverage Δ
datachain	87.22% <97.14%> (+<0.01%)	⬆️

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