Write restart files using the write grid component in UFS

[DusanJovic-NOAA]

Description

This PR adds new module that enables writing the restart files using the write grid component in UFS. The new module is located in driver/fvGFS/ and is only used by UFS.

Fixes # (issue)

How Has This Been Tested?

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Checklist:

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• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[bensonr]

We use the convention of north and east within FMS when referring to staggered variables. You are already using east and I suggest replacing south with north to keep the conventions the same.

[DusanJovic-NOAA]

We use the convention of north and east within FMS when referring to staggered variables. You are already using east and I suggest replacing south with north to keep the conventions the same.

Done. See 83f596d

[junwang-noaa]

I am not sure if I understand correctly. But the lines 123-127 look the same as line 129-133, do we need this if statement?

[junwang-noaa]

Not sure if I understand this if statement (and comments) . Isn't line 208 said that this is non-hydrostatic? Can we have:

if (.not. atm%flagstruct%make_nh) then
 lines 216-220
endif

[DusanJovic-NOAA]

I copied the logic from:

https://github.com/NOAA-GFDL/GFDL_atmos_cubed_sphere/blob/dev/emc/tools/fv_io.F90#L301-L315

[junwang-noaa]

We use the convention of north and east within FMS when referring to staggered variables. You are already using east and I suggest replacing south with north to keep the conventions the same.

Done. See 83f596d

@bensonr would you please review again? Thanks

[jkbk2004]

all tests are done on ufs-community/ufs-weather-model#1633. @bensonr @laurenchilutti can you merge the pr?