perf(path): only clone string for the path

[fvaleye]

Description

Slight change in the find_files by only cloning the string for the path (from this PR)

Benchmark

• Before optimization:
  Time: 668.73 µs
  Clones all fields: path, partition_values HashMap, stats strings, etc.

• After optimization:
  Time: 366.62 µs
  Only clones the path String once
  Moves the Add struct instead of deep cloning

[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 74.30%. Comparing base (4cf1bea) to head (f07602c).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/core/src/delta_datafusion/find_files.rs	88.88%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3841      +/-   ##
==========================================
- Coverage   74.32%   74.30%   -0.02%     
==========================================
  Files         147      147              
  Lines       39717    39700      -17     
  Branches    39717    39700      -17     
==========================================
- Hits        29518    29500      -18     
- Misses       8808     8810       +2     
+ Partials     1391     1390       -1     

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[roeap]

❤️ Nice improvement at very low cost!

Eventually, I hope we can eliminate operations using add actions directly and do this all on the (filtered to what's needed) arrow data directly. But that certainly is a larger effort for another day 😄.