Add new Ensemble-Stat line type to store the decomposition of the empirical CRPS into reliability and potential.

[JohnHalleyGotway]

Describe the New Feature

MET #1450 adds the empirical CRPS and corresponding skill score to the ECNT line type, as described in Hersbach, 2000. During that development, the UK MetOffice pointed out that their existing verification system (ver) is able to decompose the CRPS into its components: CRPS = Reliability + Potential. Doing so for a single case is straight-forward enough but aggregating those scores over multiple cases is challenging. Properly doing so requires that an alpha and beta value be stored for each ensemble member. Adding 2 * number of ensemble members to the existing ECNT line type was not practical, and so the decomposition was not computed.

This task is to add a new Ensemble-Stat line type for the CRPS decomposition. It should include the CRPS_EMP, CRPS_REL, CRPS_UNC, and the alpha and beta values for each member. Also for this issue, ensure that Stat-Analysis can aggregate multiple lines together.

Don't forget to define corresponding METdatadb and/or METviewer issues to store this new line type!

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[JohnHalleyGotway]

Here are some development notes I used when testing the python and R packages for doing the empirical CRPS decomposition:
Dev_Notes.txt

[JohnHalleyGotway]

@mpm-meto, is this feature required for MET-11.0.0-beta4 or can it be pushed to the next release in favor of other higher priority issues?