[WIP] Similarity search with vector search

[esoteric-ephemera]

Adds find_similar method to SimilarityRester to leverage Atlas vector search on the updated similarity collection. Requires emmet #1347

[codecov-commenter]

Codecov Report

❌ Patch coverage is 28.12500% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.82%. Comparing base (52a3c57) to head (2e8d9f8).

Files with missing lines	Patch %	Lines
mp_api/client/routes/materials/similarity.py	28.12%	23 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1032      +/-   ##
==========================================
- Coverage   67.29%   66.82%   -0.48%     
==========================================
  Files          50       50              
  Lines        2770     2800      +30     
==========================================
+ Hits         1864     1871       +7     
- Misses        906      929      +23     

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[esoteric-ephemera]

Now depends on emmet #1364