Support setting sea ice thermodynamics to nothing

[taimoorsohail]

This PR adds support to set sea ice thermodynamics to nothing.

Summary

• Add sea_ice_ocean_salinity_flux as a ComponentInterfaces keyword.
• Thread the salinity-flux toggle into sea ice-ocean interface construction.
• Extend IceBathHeatFlux and ThreeEquationHeatFlux to carry sea_ice_heat_flux and salinity_flux switches.
• Allow sea_ice_ocean_salinity_flux = nothing to zero sea ice-ocean salt flux, matching the existing heat-flux behaviour.

[codecov]

Codecov Report

❌ Patch coverage is 1.44928% with 68 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...dels/InterfaceComputations/sea_ice_ocean_fluxes.jl	0.00%	55 Missing ⚠️
...dels/InterfaceComputations/component_interfaces.jl	10.00%	9 Missing ⚠️
...mputations/sea_ice_ocean_heat_flux_formulations.jl	0.00%	4 Missing ⚠️

📢 Thoughts on this report? Let us know!

[navidcy]

@taimoorsohail ping us when this is ready to review

[taimoorsohail]

@simone-silvestri I need some advice on this PR. Setting sea_ice_ocean_heat_flux=nothing bypasses the ocean/sea-ice thermodynamics altogether at the moment, because if there is no heat flux, there is no melting/freezing, and there is thus no implied salt flux either. This leads to a physically weird outcome where there is no freezing limiter and the water can supercool without freezing.

We could borrow the FreezingLimitedOceanTemperature work from OceanOnlyModel, this would ensure that there is basal melting/freezing due to air-sea heat fluxes, and salinity fluxes associated with that melting/freezing. But then that begs the question if the user will want that level of surgical precision to turn off heat and salt fluxes independently.

I propose we support a more simple sea_ice_ocean_thermodynamics=nothing kwarg, just like we set dynamics=nothing, NOT x_dynamics = nothing, y_dynamics=nothing etc. This means the user cannot set salinity and heat fluxes to nothing independently, but perhaps that is not necessary? Note we would still need the freezing limiter that is in OceanOnlyModel in this case.