Enhance METcalcpy to use the `TOTAL_DIR` column when aggregate statistics wind direction statistics in the VL1L2, VAL1L2, and VCNT columns

Describe the Enhancement

Issue dtcenter/METdataio#307 updates the schema to load the new TOTAL_DIR column from the VL1L2, VAL1L2, and VCNT line types added during the beta5 development cycle for MET version 12.0.0. This issue is to update METcalcpy to refine the aggregation logic for the VL1L2, VAL1L2, and VCNT line types. When aggregating statistics from those line types beginning with DIR_ME, DIR_MAE, or DIR_MSE use the counts in the TOTAL_DIR column to define the weights rather than those found in the TOTAL column, which is the existing logic.

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Define Related Issue(s)

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[x] 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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dtcenter / METcalcpy