MNT NMSlibTransformer

[VarIr]

This is NMSlibTransformer maintenance.

• Unit tests (comparing euclidean & cosine distances of LegacyHNSW vs. NMSlibTransformer
• FEAT sparse matrix support in various metrics
• FIX LegacyHNSW cosine distances: previously returned cosine similarities (due to confusion of what nmslib calls cosinesimil, which is actually cosine distance)

[codecov[bot]]

Codecov Report

Merging #87 (b32f3fb) into main (70cd194) will increase coverage by 2.59%. The diff coverage is 85.91%.

@@            Coverage Diff             @@
##             main      #87      +/-   ##
==========================================
+ Coverage   80.99%   83.58%   +2.59%     
==========================================
  Files          34       34              
  Lines        2394     2449      +55     
  Branches      288      296       +8     
==========================================
+ Hits         1939     2047     +108     
+ Misses        433      373      -60     
- Partials       22       29       +7     

Impacted Files	Coverage Δ
skhubness/neighbors/tests/test_hnsw.py	88.76% <81.13%> (-11.24%)	:arrow_down:
skhubness/neighbors/_nmslib.py	88.31% <100.00%> (+43.79%)	:arrow_up:

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