Enhancement: Support separate climatology datasets for both the forecast and observation inputs

[georgemccabe]

dtcenter/MET#2924 describes changes that will be made to MET to support forecast climo_mean and climo_stdev.

Describe the Enhancement

Enhance the METplus wrappers to accompany the MET changes. From Slack, @JohnHalleyGotway noted:

For METplus, I imagine we’d just want to…

• Add support for FCST_CLIMO_MEAN and OBS_CLIMO_MEAN… and use them to set “climo_mean” inside the MET “fcst” dictionary.
• Add support for FCST_CLIMO_STDEV and OBS_CLIMO_STDEV… and use them to set “climo_stdev” inside the MET “obs” dictionary.
• If the FCST/OBS_CLIMO_MEAN/STDEV entries are not set, but CLIMO_MEAN/STDEV are, just set:
  • FCST_CLIMO_MEAN = OBS_CLIMO_MEAN = CLIMO_MEAN
  • FCST_CLIMO_STDEV = OBS_CLIMO_STDEV = CLIMO_STDEV

Time Estimate

~1 day

Sub-Issues

Consider breaking the enhancement down into sub-issues.

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Relevant Deadlines

6.0.0

Funding Source

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Define the Metadata

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Define Related Issue(s)

Consider the impact to the other METplus components.

• [ ] METplus, MET, METdataio, METviewer, METexpress, METcalcpy, METplotpy

Enhancement Checklist

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• [ ] Complete the issue definition above, including the Time Estimate and Funding Source.
• [ ] Fork this repository or create a branch of develop. Branch name: feature_<Issue Number>_<Description>
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