feat(rust): add checkout_latest to Dataset

[wjones127]

This is faster than doing dataset.checkout_version(dataset.latest_version_id().await?).await?, since we don't need to do an extra IOP to get the size and manifest path style of the version. (We do this in LanceDB right now.)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 78.84%. Comparing base (fdbe4a8) to head (4081afe).

Files with missing lines	Patch %	Lines
rust/lance/src/dataset.rs	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2991      +/-   ##
==========================================
- Coverage   78.84%   78.84%   -0.01%     
==========================================
  Files         236      236              
  Lines       73552    73556       +4     
  Branches    73552    73556       +4     
==========================================
+ Hits        57995    57997       +2     
+ Misses      12553    12549       -4     
- Partials     3004     3010       +6     

Flag	Coverage Δ
unittests	78.84% <75.00%> (-0.01%)	⬇️

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