Add new UGRID config from MET to METplus Wrappers

[DanielAdriaansen]

Describe the Enhancement

After dtcenter/MET#2231, there are new MET configuration file options that are not currently supported in METplus Wrappers. The configuration file options are here:

https://github.com/dtcenter/MET/blob/afb45764185bb280bacaf134ae191c6b39d041a9/data/config/PointStatConfig_default#L300-L306

and here:
https://github.com/dtcenter/MET/blob/afb45764185bb280bacaf134ae191c6b39d041a9/data/config/GridStatConfig_default#L265-L271

The work is to add six new config options to METplus Wrappers:

POINT_STAT_UGRID_DATASET
POINT_STAT_UGRID_MAX_DISTANCE_KM
POINT_STAT_UGRID_COORDINATES_FILE
GRID_STAT_UGRID_DATASET
GRID_STAT_UGRID_MAX_DISTANCE_KM
GRID_STAT_UGRID_COORDINATES_FILE

Note that there are also two new UGRID config files in the MET repo. I am unclear at this time how these relate to METplus Wrappers, but I will use METPLUS_MET_CONFIG_OVERRIDES to set the above items for now and see if these new UGRID config files cause trouble with METplus Wrappers. I will update this issue with more details soon.

Update: The new UGRID capability works by setting POINT_STAT_MET_CONFIG_OVERRIDES so there is no additional work for the new UGRID config files beyond supporting the new conf items.

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[DanielAdriaansen]

FYI @willmayfield

[georgemccabe]

This is a duplicate of #2433. In that issue, I asked for clarification of the names of the new config variables and did not receive a response. See the discussion on that issue and let me know how to proceed.

[DanielAdriaansen]

Thanks @georgemccabe sorry for the duplication.