feat!: update_table returns stats

[QianZhu]

BREAKING CHANGE: UpdateJob::execute() now returns statistics about number of rows changed.

update_table returns

• num of rows updated for billing - writes

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.

Project coverage is 77.89%. Comparing base (60797a6) to head (8da0515). Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
rust/lance/src/dataset/write/update.rs	91.66%	0 Missing and 1 partial :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2867      +/-   ##
==========================================
+ Coverage   77.87%   77.89%   +0.01%     
==========================================
  Files         231      231              
  Lines       70513    70523      +10     
  Branches    70513    70523      +10     
==========================================
+ Hits        54915    54936      +21     
- Misses      12465    12469       +4     
+ Partials     3133     3118      -15     

Flag	Coverage Δ
unittests	77.89% <92.85%> (+0.01%)	:arrow_up:

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