Add option to specify custom noise kernels

[ziatdinovmax]

No description provided.

[codecov-commenter]

Codecov Report

Merging #48 (8f69aa4) into main (1da4588) will decrease coverage by 0.01%.
The diff coverage is 96.77%.

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@@            Coverage Diff             @@
##             main      #48      +/-   ##
==========================================
- Coverage   95.99%   95.99%   -0.01%     
==========================================
  Files          44       44              
  Lines        3519     3542      +23     
==========================================
+ Hits         3378     3400      +22     
- Misses        141      142       +1     

Flag	Coverage Δ
unittests	95.99% <96.77%> (-0.01%)	⬇️

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Files	Coverage Δ
gpax/utils/__init__.py	100.00% <100.00%> (ø)
gpax/utils/priors.py	98.01% <100.00%> (+0.19%)	⬆️
tests/test_utilpriors.py	99.42% <100.00%> (+0.02%)	⬆️
gpax/models/hskgp.py	95.45% <90.00%> (-0.94%)	⬇️

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