Option to return full (cumulative) profile from thickness_hydrostatic functions

[andreas-h]

It would be useful if one could calculate the thickness of layers of the full atmosphere in one go, i.e., if thickness_hydrostatic_from_relative_humidity() and thickness_hydrostatic() would (optionally) not only return the full thickness (i.e., between bottom and top) but instead all the layer thicknesses individually.

To explain more technically: The current return value (the full thickness) would then be the top layer of the cumsum of the individual thicknesses.

[jthielen]

This would help clean up some of #2064.

[brianmapes]

+1 in 2022