Refactored tests to use pytest instead of unittest

[lucasimi]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 95.00000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 93.15%. Comparing base (27d51f3) to head (e13162e).

Files with missing lines	Patch %	Lines
src/tdamapper/utils/vptree_flat/vptree.py	83.33%	2 Missing ⚠️
src/tdamapper/utils/vptree_flat/knn_search.py	96.00%	1 Missing ⚠️
src/tdamapper/utils/vptree_hier/ball_search.py	94.11%	1 Missing ⚠️
src/tdamapper/utils/vptree_hier/knn_search.py	93.75%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #221   +/-   ##
=======================================
  Coverage   93.15%   93.15%           
=======================================
  Files          20       20           
  Lines        1066     1066           
=======================================
  Hits          993      993           
  Misses         73       73           

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