Add silhouette score

[raphasampaio]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 96.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 96.18%. Comparing base (02c7d09) to head (e53495a).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
src/silhouette_score.jl	96.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #80      +/-   ##
==========================================
- Coverage   96.18%   96.18%   -0.01%     
==========================================
  Files          27       28       +1     
  Lines        1049     1074      +25     
==========================================
+ Hits         1009     1033      +24     
- Misses         40       41       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.