Eddy-viscosity models in ClimaCore.jl

[akshaysridhar]

Additional of simple eddy-viscosity (strain-rate based) models. Test + use-cases (rising bubble + density current)

• [x] Smagorinsky
• [ ] Vreman
• [ ] Anisotropic Minimum Dissipation
• [ ] Unit Tests

[szy21]

@akshaysridhar are we still doing this in climacore, or will this be in climaatmos?