Clean up treatment of floating point precision and use Oceananigans.defaults.FloatType

[glwagner]

This makes ClimaOcean obey the default set by Oceananigans, and also converts the grids for bathymetry and ECCO to Float32, which I think is correct and might save some memory.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 19 lines in your changes missing coverage. Please review.

Project coverage is 0.00%. Comparing base (a27e5f1) to head (1795dcb).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...eModels/InterfaceComputations/roughness_lengths.jl	0.00%	5 Missing ⚠️
src/OceanSeaIceModels/PrescribedAtmospheres.jl	0.00%	4 Missing ⚠️
src/Bathymetry.jl	0.00%	2 Missing ⚠️
...Computations/similarity_theory_turbulent_fluxes.jl	0.00%	2 Missing ⚠️
src/DataWrangling/ECCO/ECCO.jl	0.00%	1 Missing ⚠️
...Computations/coefficient_based_turbulent_fluxes.jl	0.00%	1 Missing ⚠️
...ceModels/InterfaceComputations/interface_states.jl	0.00%	1 Missing ⚠️
...eanSeaIceModels/InterfaceComputations/radiation.jl	0.00%	1 Missing ⚠️
...ceModels/InterfaceComputations/tabulated_albedo.jl	0.00%	1 Missing ⚠️
...SeaIceModels/freezing_limited_ocean_temperature.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #346   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files         36      36           
  Lines       2291    2291           
=====================================
  Misses      2291    2291           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.