testing: assert_allclose with allowed failures

[mathause]

A helper function to check if two arrays are close, but allows a number of failures. This could help with #501 where most of the array is close but some points are not & expect this could become more important? Uses the numpy machinery, thus does not work with xarray. However, there is no isclose function for DataArray and Dataset and xr.testing.assert_allclose is a mess.

See also np.testing.assert_allclose??

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.45%. Comparing base (f4c286c) to head (f8231fa).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #563      +/-   ##
==========================================
- Coverage   77.39%   76.45%   -0.95%     
==========================================
  Files          48       48              
  Lines        2920     2930      +10     
==========================================
- Hits         2260     2240      -20     
- Misses        660      690      +30     

Flag	Coverage Δ
unittests	76.45% <100.00%> (-0.95%)	⬇️

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