Move 'priors' out of 'utils' and turn them into a separate module

[ziatdinovmax]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 98.07692% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 95.25%. Comparing base (64bbec2) to head (cb28ab8).

Files	Patch %	Lines
gpax/utils/fn.py	97.95%	1 Missing ⚠️
tests/test_func_setter.py	97.82%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #94      +/-   ##
==========================================
- Coverage   95.26%   95.25%   -0.02%     
==========================================
  Files          55       58       +3     
  Lines        4269     4280      +11     
==========================================
+ Hits         4067     4077      +10     
- Misses        202      203       +1     

Flag	Coverage Δ
unittests	95.25% <98.07%> (-0.02%)	⬇️

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