Enhancement: Add support for setting file_type in the fcst and obs dictionaries for all wrappers that support it

[georgemccabe]

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Describe the Enhancement

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Time Estimate

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Issues should represent approximately 1 to 3 days of work.

Sub-Issues

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Define Related Issue(s)

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

Enhancement Checklist

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