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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Sub-Issues

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Relevant Deadlines

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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>
• [ ] Complete the development and test your changes.
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• [ ] Add/update documentation.
• [ ] Add any new Python packages to the METplus Components Python Requirements table.
• [ ] Push local changes to GitHub.
• [ ] Submit a pull request to merge into develop. Pull request: feature <Issue Number> <Description>
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• [ ] Iterate until the reviewer(s) accept and merge your changes.
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• [ ] Close this issue.