Permit use of bulk formulae to calculate surface forcing in ocean-only mode.

[Hallberg-NOAA]

Currently, MOM6 does not have code to directly calculate air-sea fluxes from an atmospheric state. Instead, it relies upon the coupler that is driving the ocean model to determine these fluxes. There are, however, cases where it would be very convenient if these fluxes could be calculated directly from a specified atmospheric state in an ocean-only mode.

[raphaeldussin]

@sanAkel this could be a good starting point: https://github.com/NOAA-GFDL/FMScoupler/blob/9da2d61f74671ccee775553a36439260c9241383/shared/surface_flux.F90#L841

feel free to ping me on this as I'm also interested.