test(p/avl): increase test coverage

[notJoon]

Description

I added tests to the AVL package.
Checking in Go, the coverage comes out to be 88.6%.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.83%. Comparing base (35a29a5) to head (1a6845c).
Report is 24 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1881      +/-   ##
==========================================
- Coverage   47.79%   45.83%   -1.96%     
==========================================
  Files         393      483      +90     
  Lines       61643    69268    +7625     
==========================================
+ Hits        29463    31752    +2289     
- Misses      29708    34888    +5180     
- Partials     2472     2628     +156     

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[harry-hov]

Left few suggestions. Rest LGTM 💯

Thank you for doing this. 🙏

[notJoon]

Left few suggestions.

Thank you for the review @harry-hov ! I have resolved all the parts you commented on.

Heres the additional modifications:

• extracted the leaf node insertion logic from the Set function and created a separate setLeaf function.
• remove stop variable from the TraverseInRange function.

[harry-hov]

Added one last comment from my side. Otherwise we are good to merge 🙏