feat: add keep_versions parameter to vacuum command for python

[corwinjoy]

Description

Update the delta_table.vacuum command to add a keep_versions argument to specify versions to retain when performing a vacuum operation.

Related Issue(s)

Closes #3634
See the underlying Rust feature: #3537

[corwinjoy]

via copilot:

Pull Request Overview

This PR adds a new keep_versions parameter to the vacuum command for Python, allowing users to specify specific table versions whose files should be preserved during vacuum operations.

Key changes:

• Added keep_versions parameter to vacuum method signatures
• Updated vacuum implementation to handle the new parameter
• Added comprehensive test coverage for the new functionality

[corwinjoy]

@rtyler @adamreeve
This should add the missing piece to access the new keep_versions feature from Python.
I'm not sure if I need to update any docs for the new function signature?

[codecov]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.44%. Comparing base (bc0fba8) to head (1fb13cd).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
python/src/lib.rs	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3635      +/-   ##
==========================================
- Coverage   75.45%   75.44%   -0.02%     
==========================================
  Files         146      146              
  Lines       44901    44905       +4     
  Branches    44901    44905       +4     
==========================================
- Hits        33879    33877       -2     
- Misses       9204     9210       +6     
  Partials     1818     1818              

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