Wire up Sl_ddvel (gas dry-dep coupling) and cam_in%dstflx (Fall_flxdst) to CMEPS via nuopc

[jimmielin]

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Originator(s): @jimmielin
AI tools used (if applicable; please also add the "AI-generated code" label to the PR):
What: claude-fable:5
How: scoped the NUOPC/CMEPS path and the CAM infrastructure.

Description (include the issue title, and the keyword ['closes', 'fixes', 'resolves'] followed by the issue number):

• Wire up number of dry deposited species and Sl_ddvel dry deposition velocity via the coupler for gas-phase dry deposition.
• Wire up dust emission fluxes from land via Fall_flxdst field into cam_in%dstflx. Fixes the wrong dimensions (missing indexed 4 dimension). Requires CAM side fix: part of cam6_4_192: Add snapshot support for FRACIS, cam_in_dstflx, which have constituent or other dimensions CAM#1610 and CAM-SIMA side fix to read this field: Constituent- and index-dimensioned fields for read and check physics data #521

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M       src/cpl/nuopc/atm_import_export.F90
  - wire up Sl_ddvel, Fall_flxdst

M       src/data/registry.xml
  - fix dust dimensions in cam_in%dstflx
  - adds dust dimensions with a note that this is not configurable without a coordinated overhaul of the dust infrastructure coordinated with everyone else.

A       src/physics/utils/drydep_coupling.F90
A       src/physics/utils/drydep_coupling.meta
  - used to mirror NUOPC cap drydep_nflds for providing to physics schemes.
  - this must be in a separate module via a setter because simple re-export via USE is not accepted by capgen.

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derecho/intel/aux_sima:

derecho/gnu/aux_sima:

derecho/nvhpc/aux_sima (test is run via Github workflow. Only run the test manually if we need to save new baselines):

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