Update WW3 for 2-way ocean-wave coupling in HAFS

[binli2337]

Is your feature request related to a problem? Please describe.

The HAFS application will be updated to include 2-way ocean-wave coupling capability.

The related CMEPS component will be updated to interpolate ocean-current fields from MOM6 grid to WW3 grid. Since regional MOM6 domain and regional WW3 domain do not completely overlap, a missing value is assigned to the interpolated ocean-current fields in the non-overlapped regions (where the WW3 grids are outside the MOM6 domain). In the CMEPS component, the missing value is 9.99e20.

Describe the solution you'd like
To prevent a model crash, a short-term solution is to convert the missing value to zero for the ocean-current fields in WW3/model/src/wav_import_export.F90.

Describe alternatives you've considered
In the future, when ocean-current fields can be provided by global MOM6 output, the ocean-current fields over the WW3 domain can be obtained by merging the global MOM6 fields with those from the regional MOM6 model in CMEPS.

Additional context
Add any other context or screenshots about the feature request here.