[WIP] Dbscan

[charavelg]

Add dbscan estimator for #598.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.90%. Comparing base (38e5898) to head (bd54e90).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #611      +/-   ##
==========================================
+ Coverage   91.76%   91.90%   +0.14%     
==========================================
  Files          68       69       +1     
  Lines        6203     6314     +111     
==========================================
+ Hits         5692     5803     +111     
  Misses        511      511              

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