add sampling function with poisson sampling and density input

[ismael-mendoza]

No description provided.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (0ff9166) 61.15% compared to head (12cf7a7) 61.63%.

Files	Patch %	Lines
btk/sampling_functions.py	95.45%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #469      +/-   ##
==========================================
+ Coverage   61.15%   61.63%   +0.47%     
==========================================
  Files          19       19              
  Lines        1555     1577      +22     
==========================================
+ Hits          951      972      +21     
- Misses        604      605       +1     

Flag	Coverage Δ
unittests	61.63% <95.45%> (+0.47%)	⬆️

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