Knn graph code refactor

[01PrathamS]

Summary

🎯 Purpose: refactor reused code process_knn_graph_from_inputs

[ ✏️ implement process_knn_graph_from_inputs as an instance method under ConstructedKNNGraph class in new file utils.py ]

solves: #889

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (a6d1319) 96.72% compared to head (9a65c38) 96.80%. Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #898      +/-   ##
==========================================
+ Coverage   96.72%   96.80%   +0.08%     
==========================================
  Files          69       70       +1     
  Lines        5402     5381      -21     
  Branches      925      916       -9     
==========================================
- Hits         5225     5209      -16     
+ Misses         89       86       -3     
+ Partials       88       86       -2     

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