Enhance Multivariate MODE to read input data only once rather than multiple times

[davidalbo]

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Describe the Enhancement

Current implementation reads data twice ('part1 simple' and 'part1 merge'. Store in memory instead as part of part1 simple, access that in part1 merge.

Time Estimate

24 hours

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Relevant Deadlines

January 16, 2024 (beta3)

Funding Source

NOAA base

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[davidalbo]

This issue was resolved in the changes made here: https://github.com/dtcenter/MET/pull/2779. The new design reads in each input only once and keeps it in memory for use in several processing steps.