Add seed to leiden clustering

[adamgayoso]

Fixes #104

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 91.14%. Comparing base (c19679c) to head (d48f373).
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/scib_metrics/metrics/_nmi_ari.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #173      +/-   ##
==========================================
+ Coverage   91.11%   91.14%   +0.02%     
==========================================
  Files          26       26              
  Lines         968      971       +3     
==========================================
+ Hits          882      885       +3     
  Misses         86       86              

Files	Coverage Δ
src/scib_metrics/metrics/_nmi_ari.py	94.23% <83.33%> (+0.35%)	⬆️