feat(python): Support lakefs:// URI for delta scanner

[ion-elgreco]

In deltalake 0.24 I've added support for LakeFS, this means users can use lakefs:// uri's to read and write delta tables in LakeFS.

Internally in delta-rs, we just construct an S3 ObjectStore and some other things which I won't bother you with :). Point is polars can safely read lakefs:// uri's as s3:// uris. If we find lakefs:// uri's we just rewrite them as s3://.

If you want I can also move this in to rust, but I want to mostly keep this for the delta reader/scanner.

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 79.74%. Comparing base (725c960) to head (4add192).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
py-polars/polars/io/delta.py	33.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #20757      +/-   ##
==========================================
- Coverage   79.74%   79.74%   -0.01%     
==========================================
  Files        1561     1561              
  Lines      222012   222015       +3     
  Branches     2530     2531       +1     
==========================================
- Hits       177049   177041       -8     
- Misses      44381    44391      +10     
- Partials      582      583       +1     

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[ion-elgreco]

@nameexhaustion could you take a look? Can't seem to add reviewer requests myself : )

[nameexhaustion]

Can you confirm that you've tested it works? After that I think it's ready to merge.

I think it's ok to have it in the Python side for now, we can add this rewrite to the path expansion step on the rust side later if we want to add support for other I/O scan functions.

[ion-elgreco]

@nameexhaustion yes it works :)