Downscaling sea surface current field from parent grid to nested grid

[binli2337]

Is your feature request related to a problem? Please describe.
The surface ocean current will be included in the computation of air-sea fluxes in both parent grid and nested grid. The code needs to be updated to transfer the surface current filed from parent grid to the nested grid.

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Additional context
Related PR: #311

[bensonr]

#311 has been merged