Rename variable after AtmosModel refactor

[nefrathenrici]

Purpose

Finish renaming variables after #3875. This is a breaking PR due to name changes within AtmosModel.

To-do

Content

Rename:

• AtmosModel.vert_diff -> vertical_diffusion
• AtmosModel.water.precip_model -> microphysics_model
• PrognosticSurfaceTemperature -> SlabOceanSST
• PrescribedSurfaceTemperature -> PrescribedSST

Note that all parsed args are still supported but `"prognostic_surface" = "prognostic/prescribedsurfacetemperature" is deprecated.

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• I have read and checked the items on the review checklist.

[szy21]

Could you also rename PrescribedSurfaceTemperature to PrescribedSST so it is more consistent?

[nefrathenrici]

Could you also rename PrescribedSurfaceTemperature to PrescribedSST so it is more consistent?

Do you prefer PrescribedSST or PrescribedOceanSST?

[szy21]

Could you also rename PrescribedSurfaceTemperature to PrescribedSST so it is more consistent?

Do you prefer PrescribedSST or PrescribedOceanSST?

I prefer PrescribedSST as it is shorter and clear enough to me, but if you prefer the other one, feel free to use it.

[tapios]

Looks good to me. Thank you!

[trontrytel]

Thank you! Will take some time to get used to grepping for microphysics_model rather than precip_model ;) But I think the changes do improve the code readability.