more systematic import of packages

[LenkaNovak]

It would be good to decide on our convention on how we import packages and the short hands for them. (e.g. CA for ClimaAtmos).

solution

• if using a Clima package that we commonly use, use import PackageName as PN (e.g. ClimaAtmos -> CA, SurfaceFluxes -> SF)
• if using an external package, use import PackageName (e.g. for Dates or JLD2)
• if using a module within ClimaCoupler, use import ClimaCoupler.Module: struct1, function1, function2, ...
• maintain flexibility within this approach, especially to prevent the need to qualify e.g. macros or symbols we use from other packages

package shorthands:

• ClimaAtmos -> CA
• ClimaCore -> CC
• ClimaCoreTempestRemap -> CCTR
• ClimaLand -> CL
• SurfaceFluxes -> SF
• Thermodynamics -> TD
• ClimaAnalysis -> CAN