Function to change local classifier

[ashishpatel16]

As of now, there is no functionality to update a classifier, one must recreate a new instance of the Hierarchical classifier. This PR adds a new method to update the local classifier model used.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 98.25%. Comparing base (a4c79e8) to head (13feb3f).
⚠️ Report is 22 commits behind head on main.

Files with missing lines	Patch %	Lines
hiclass/HierarchicalClassifier.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #100      +/-   ##
==========================================
- Coverage   98.40%   98.25%   -0.16%     
==========================================
  Files           8        8              
  Lines         566      572       +6     
==========================================
+ Hits          557      562       +5     
- Misses          9       10       +1     

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