Add support for probability field threshold in SeriesAnalysis

[j-opatz]

Describe the Enhancement

Currently in SeriesAnalysis, if the forecast or observation field is set as a probability, it needs to have a probability threshold. However, there is no dedicated variable for this (i.e. FCST_SERIES_ANALAYSIS_PROB_THRESH) as there is in GridStat and Point2Grid. This enhancement is to create that variable and allow iterative thresholds (via ==) to be set.

Time Estimate

The issue for this is being created retroactively, so the work did take about an hour or so.

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Relevant Deadlines

Needed for Probability of Exceedance (POE) work with CPC data, but no set deadline

Funding Source

None

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