Parse comma-separated list as python list

[WalterKolczynski-NOAA]

Description Adds parsing of a comma-separated list to a python list to Configuration.

In support of NOAA-EMC/global-workflow#2274

Type of change

• [x] New feature (non-breaking change which adds functionality)

How Has This Been Tested?

• [x] pynorms
• [x] pytests

Checklist

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] My changes need updates to the documentation. I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] New and existing tests pass with my changes
• [x] Any dependent changes have been merged and published

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 50.12%. Comparing base (86bfe2b) to head (c68d7dc).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #39 +/- ## =========================================== + Coverage 50.06% 50.12% +0.06% =========================================== Files 18 18 Lines 1650 1652 +2 Branches 337 339 +2 =========================================== + Hits 826 828 +2 Misses 765 765 Partials 59 59 ```

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[WalterKolczynski-NOAA]

looks good.

I am wondering if this will have an unintended side-effect on g-w where such a string exists in one of the configs. It should be rectified in the g-w if it does.

I thought about that, because some of the namelist variables do use comma-separated lists the same way. But we don't really use any of those in the python system (and if we were to use them in python somewhere down the line, we would probably want them in list for too).