Create interface for translating Xarray object attributes to MET attributes

[DanielAdriaansen]

Describe the Enhancement

Users who choose to use Xarray objects with Python embedding will almost certainly arrive at the MET tools with an Xarray object that already has attributes attached to it. To streamline the user experience with Python embedding and Xarray, consider developing a way to decipher the attributes associated with the users Xarray object and make them conform to the MET standard for attributes expected for Python embedding. The current implementation of this feature requires the user to develop these attributes from scratch using the MET standards, remove their existing attributes from the Xarray object, and attach the MET-compliant attributes they created from scratch. It's likely many of the items MET is looking for already exist in the attributes the user will arrive with.

Time Estimate

2-3 days

Relevant Deadlines

NONE

Funding Source

NONE

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Define Related Issue(s)

Consider the impact to the other METplus components.

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

Enhancement Checklist

See the METplus Workflow for details.

• Complete the issue definition above.
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  Branch name: feature_<Issue Number>_<Description>
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[DanielAdriaansen]

Most (all?) of the attributes MET needs for Python embedding appear to be in the dataplane_from_numpy_array class here:
https://github.com/dtcenter/MET/blob/master_v9.1/met/src/libcode/vx_data2d_python/dataplane_from_numpy_array.cc