atmospheric params changes

[ojdf]

Added an axis parameter to isoplanaticAngle and coherenceTime, making these funcions compatible with multi-dimensional arrays, with the integration performed over this axis.

Also added a rytov_variance function because it might be useful.

Had to fix some tests for atmos_conversions as well.

[codecov]

Codecov Report

Merging #83 (34d51b0) into main (76dd3dc) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #83      +/-   ##
==========================================
- Coverage   92.10%   92.08%   -0.02%     
==========================================
  Files          42       42              
  Lines        1988     1997       +9     
==========================================
+ Hits         1831     1839       +8     
- Misses        157      158       +1     

Impacted Files	Coverage Δ
aotools/turbulence/atmos_conversions.py	100.00% <100.00%> (ø)
test/test_atmos_conversions.py	100.00% <100.00%> (ø)
aotools/functions/karhunenLoeve.py	92.13% <0.00%> (-0.38%)	⬇️

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