Speed up ContextualCountEmbedder operation

[RaczeQ]

Refactored srai.embedders.contextual_count_embedder by removing for loop over all dataframe rows with loc replacement.

Whole operation is now vectorized and works on numpy arrays.

Common code for squashed and concatenated version of the embedder has been extracted to the new function _get_averaged_values_for_distances.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (1cd0f13) 92.08% compared to head (2306b2a) 91.92%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #363      +/-   ##
==========================================
- Coverage   92.08%   91.92%   -0.17%     
==========================================
  Files          60       60              
  Lines        2211     2203       -8     
==========================================
- Hits         2036     2025      -11     
- Misses        175      178       +3     

Flag	Coverage Δ
macos-latest-python3.11	91.92% <100.00%> (-0.17%)	⬇️
ubuntu-latest-python3.10	91.82% <100.00%> (-0.17%)	⬇️
ubuntu-latest-python3.11	91.92% <100.00%> (-0.17%)	⬇️
ubuntu-latest-python3.8	91.85% <100.00%> (-0.08%)	⬇️
ubuntu-latest-python3.9	91.76% <100.00%> (-0.26%)	⬇️

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Files	Coverage Δ
srai/embedders/contextual_count_embedder.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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