Class imbalance support for return_label_overlap method

[alexserra98]

Proposed changes

I've modified the method

.return_label_overlap()

from MetricComparisons() to support class imbalance.

Types of changes

The method now check for class imbalance and if True compute the overlap using a number $k$ of nearest neighbours that change as a function of number of elements per class. By default $k$ is set as $10$% of the class population but it can be modified with the argument k_per_classes.

• [ ] Bugfix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• [x] Lint and unit tests pass locally with my changes
• [ ] I have added tests that prove my fix is effective or that my feature works

[diegodoimo]

Thank you for the improvement. I'll have a look at the code in the next few days.

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (5935c77) 79.10% compared to head (5c17eb5) 79.21%.

Files	Patch %	Lines
dadapy/metric_comparisons.py	94.11%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #114 +/- ## ========================================== + Coverage 79.10% 79.21% +0.11% ========================================== Files 15 15 Lines 2508 2536 +28 ========================================== + Hits 1984 2009 +25 - Misses 524 527 +3 ```

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