added Jaccard distance

[skywardfire1]

Hi guys!

My first PR to your library. I added Jaccard distance. Everything is done carefully in accordance to the best development practices.

Checklist

• [ YES ] My branch is up-to-date with development branch.
• [ YES ] Everything works and tested on latest stable Rust.
• [ YES, via neural network ] Coverage and Linting have been applied

Current behaviour

there is no jaccard distance!

New expected behaviour

now there IS the jaccard distance functionality in the library. Done with respect to the current API, and checked using a smass binary outside of the code.

Change logs

Added

Jaccard distance

[Mec-iS]

thanks. i will review this as soon as possible

[codecov]

Codecov Report

❌ Patch coverage is 23.80952% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 44.29%. Comparing base (70d8a0f) to head (9fdfd93).
⚠️ Report is 8 commits behind head on development.

Files with missing lines	Patch %	Lines
src/metrics/distance/jaccard.rs	26.31%	14 Missing ⚠️
src/metrics/distance/mod.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           development     #358      +/-   ##
===============================================
- Coverage        45.59%   44.29%   -1.31%     
===============================================
  Files               93       95       +2     
  Lines             8034     7997      -37     
===============================================
- Hits              3663     3542     -121     
- Misses            4371     4455      +84     

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[Mec-iS]

please run clippy with the right flags and fix the errors: https://github.com/smartcorelib/smartcore/actions/runs/22827368229/job/66322459263#step:6:1