Add FMPE

[dirmeier]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 44.64286% with 155 lines in your changes are missing coverage. Please review.

Project coverage is 71.15%. Comparing base (db2a588) to head (7da474a).

Files	Patch %	Lines
sbijax/_src/fmpe.py	19.44%	87 Missing ⚠️
sbijax/_src/nn/continuous_normalizing_flow.py	26.31%	56 Missing ⚠️
sbijax/_src/snass_test.py	85.71%	4 Missing ⚠️
sbijax/_src/snasss_test.py	86.66%	4 Missing ⚠️
sbijax/_src/snr_test.py	87.87%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #25       +/-   ##
===========================================
+ Coverage   50.36%   71.15%   +20.79%     
===========================================
  Files          29       34        +5     
  Lines        1245     1522      +277     
===========================================
+ Hits          627     1083      +456     
+ Misses        618      439      -179     

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