`ZStar` to be renamed to `ZStarCoordinate`

[navidcy]

Minor refactor in CliMA/Oceananigans.jl#4686 will break

ClimaOcean.jl/src/OceanSimulations/ocean_simulation.jl

Line 80 in 8479089

default_vertical_coordinate(::MutableGridOfSomeKind) = Oceananigans.Models.ZStar()

and would require

default_vertical_coordinate(grid::MutableGridOfSomeKind) = Oceananigans.Models.ZStarCoordinate(grid) 

[glwagner]

shouldn't that default vertical coordinate stuff live in Oceananigans?

[navidcy]

Yes!

[simone-silvestri]

I don't think we need it, it is already done in Oceananigans here https://github.com/CliMA/Oceananigans.jl/blob/e166aacf44a2dfb8ba48aa4b4ba7c42fe08170c4/src/Models/HydrostaticFreeSurfaceModels/hydrostatic_free_surface_model.jl#L27-L33