FMS_cap: extract c-grid staggered currents

[sanAkel]

This PR adds an option:

• In FMS_cap to extract uc and vc currents.
• Was added by @zhaobin74; he is working on using these exports in GEOS-ESM CICE6.
• By construction does not change answers.

Notes:

@jiandewang, @gustavo-marques, @alperaltuntas and @abozec,
AFAIK you do not use FMS_cap, so hopefully this is irrelevant to your use cases.

@marshallward, @Hallberg-NOAA, @kshedstrom:
Appreciate your comments.

[codecov]

Codecov Report

Merging #1611 (df26ff7) into main (2dd99f8) will not change coverage.
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[kshedstrom]

I approve this PR.

[jiandewang]

in UFS it only nuopc_cap so this change won't have any impact to us.

[abozec]

COAPS approves. This change does not impact our set-up.

[marshallward]

This passes our regression test, and appears to be safe.

(Index capitalization in mask2dC[uv] may need a revision at some point, however,)

[sanAkel]

This passes our regression test, and appears to be safe.

(Index capitalization in mask2dC[uv] may need a revision at some point, however,)

@marshallward Feel free to capitalize/ push an update. Anyway you'll have to update the branch.

[marshallward]

It's fine for now. I don't want to change the GEOS main commit at this stage.

[sanAkel]

@gustavo-marques, @alperaltuntas would you please comment on this PR. Thanks!

[gustavo-marques]

Apologies for the delay. We approve this PR.

[sanAkel]

Thanks @gustavo-marques.

@marshallward please update/rebase this branch, I can't do it myself via github - write permissions?
Thank you!

[marshallward]

Ah because it's out of date... you could fix this by merging main into your branch. But I can do it if you like.

[marshallward]

Requiring that branches be up-to-date feels incorrect, since we don't require partner branches to be using main, so I've disabled this requirement.

We can talk more at a future dev call if there are any potential problems with relaxing this rule.