Add leiden

[zhanglei1949]

Add leiden algorithm as plugin.

[github-actions]

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 33.11%. Comparing base (9c11778) to head (f3717e4).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4456   +/-   ##
=======================================
  Coverage   33.11%   33.11%           
=======================================
  Files         126      126           
  Lines       13261    13261           
=======================================
  Hits         4391     4391           
  Misses       8870     8870           

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