GP smoothing of analytic covmat (refactored)

[xzackli]

This is a refactored version of a PR where a Gaussian Process is trained to smooth a diagonal of a matrix.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 12.90323% with 27 lines in your changes are missing coverage. Please review.

Project coverage is 20.91%. Comparing base (293bd97) to head (3470329).
Report is 31 commits behind head on ana_cov_comp.

Files	Patch %	Lines
pspipe_utils/covariance.py	12.90%	27 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           ana_cov_comp      #51      +/-   ##
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+ Coverage         18.60%   20.91%   +2.30%     
================================================
  Files                15       16       +1     
  Lines              1725     1865     +140     
================================================
+ Hits                321      390      +69     
- Misses             1404     1475      +71     

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[xzackli]

Thanks @xgarrido!