Add clahe (experimental)

[StRigaud]

This PR integrate the CLAHE algorithm, adapted from Hugo Raveton implementation. And a demo notebook displaying the usage.

It also introduce an __experimental__ module where new algorithm and kernel can be integrated to the library for testing before being fully added to the main package.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 55.55556% with 8 lines in your changes missing coverage. Please review.

Project coverage is 87.62%. Comparing base (00bfc16) to head (e06d6dc).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
pyclesperanto/__experimental__/clahe.py	50.00%	8 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #300      +/-   ##
==========================================
- Coverage   87.97%   87.62%   -0.36%     
==========================================
  Files          20       22       +2     
  Lines        1638     1656      +18     
==========================================
+ Hits         1441     1451      +10     
- Misses        197      205       +8     

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