Add optional attribute for variables where necessary #79
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Description
All in the title. Required for supporting optional arguments in CCPP (see ufs-community/ufs-weather-model#2205 and PRs listed there).
Working towards NCAR/ccpp-framework#540
This is part of a large set of PRs:
NCAR/ccpp-framework#552
NOAA-EMC/fv3atm#807
https://github.com/ufs-community/ufs-weather-model/pull/2205
ufs-community/ccpp-physics#189
NCAR/ccpp-framework#556 (can be scheduled and merged anytime beforehand)
NOAA-GFDL/GFDL_atmos_cubed_sphere#338
#79
How Has This Been Tested?
ufs-weather-model full regression testing on Hera (all tests b4b)