Add mutual information metric

[MooooCat]

Description

Motivation and Context

How has this been tested?

Types of changes

• Maintenance (no change in code, maintain the project's CI, docs, etc.)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[codecov-commenter]

Codecov Report

Attention: 29 lines in your changes are missing coverage. Please review.

Comparison is base (d29a2a0) 78.99% compared to head (8020a9a) 78.58%.

Files	Patch %	Lines
sdgx/metrics/pair_column/base.py	45.45%	18 Missing ⚠️
sdgx/metrics/pair_column/mi_sim.py	82.60%	8 Missing ⚠️
sdgx/utils.py	40.00%	3 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #101      +/-   ##
==========================================
- Coverage   78.99%   78.58%   -0.42%     
==========================================
  Files          62       64       +2     
  Lines        2680     2764      +84     
==========================================
+ Hits         2117     2172      +55     
- Misses        563      592      +29     

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