Add probability field calc and plots

[codecov-commenter]

Codecov Report

Attention: 89 lines in your changes are missing coverage. Please review.

Comparison is base (1fbaf14) 21.29% compared to head (830ede3) 20.80%. Report is 1 commits behind head on main.

Files	Patch %	Lines
...rturbation/uncertainty_quantification/surrogate.py	0.00%	55 Missing :warning:
ensembleperturbation/plotting/surrogate.py	0.00%	33 Missing :warning:
ensembleperturbation/parsing/schism.py	0.00%	1 Missing :warning:

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```diff @@ Coverage Diff @@ ## main #127 +/- ## ========================================== - Coverage 21.29% 20.80% -0.49% ========================================== Files 28 28 Lines 3762 3850 +88 ========================================== Hits 801 801 - Misses 2961 3049 +88 ```

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[SorooshMani-NOAA]

This is an example of its use. I got better result on a different dataset, but I don't have it now!

[SorooshMani-NOAA]

@WPringle swapping the order of set small elev to null and set null to depth for model calculation, (i.e. https://github.com/noaa-ocs-modeling/EnsemblePerturbation/blob/4d82917f3e1fcce456fd7b5a587da07b7b8658e7/ensembleperturbation/uncertainty_quantification/surrogate.py#L676-L678 and https://github.com/noaa-ocs-modeling/EnsemblePerturbation/blob/4d82917f3e1fcce456fd7b5a587da07b7b8658e7/ensembleperturbation/uncertainty_quantification/surrogate.py#L679-L679 ) resulted in these plots:

I think it might make more sense to keep the swapped version. What do you think?

[SorooshMani-NOAA]

These are the first couple of probability fields for the 30 member Florence run with OFCL track (past forecast, no NWM)