feat!: shallow_clone supports index

[majin1102]

Context:

#4257 (comment)

[codecov-commenter]

Codecov Report

❌ Patch coverage is 86.42298% with 52 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.88%. Comparing base (06f8cf9) to head (99d49eb).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
rust/lance/src/index.rs	87.90%	24 Missing and 6 partials ⚠️
rust/lance/src/dataset.rs	50.00%	6 Missing and 2 partials ⚠️
rust/lance/src/index/scalar.rs	54.54%	4 Missing and 1 partial ⚠️
rust/lance/src/io/commit.rs	80.76%	0 Missing and 5 partials ⚠️
rust/lance/src/index/vector.rs	0.00%	3 Missing ⚠️
rust/lance-table/src/format/manifest.rs	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4553      +/-   ##
==========================================
+ Coverage   80.86%   80.88%   +0.02%     
==========================================
  Files         314      314              
  Lines      115127   115468     +341     
  Branches   115127   115468     +341     
==========================================
+ Hits        93098    93401     +303     
- Misses      18745    18769      +24     
- Partials     3284     3298      +14     

Flag	Coverage Δ
unittests	80.88% <86.42%> (+0.02%)	⬆️

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[majin1102]

Hi, @jackye1995 I believe this is ready for review

[majin1102]

Have added docs for Manifest.shallow_clone.

Thank you for supplementing the test cases!

[jackye1995]

Looks good to me!