Call monin_obukhov_stable_mix from stable_mix_1d

[J-Lentz]

Restructure the subroutines in the stable_mix interface of monin_obukhov_mod so that stable_mix_1d calls monin_obukhov_stable_mix, which is the underlying implementation. stable_mix_2d and stable_mix_3d now call stable_mix_1d on 1D slices of the data.

This change is needed for the mixed precision updates to monin_obukhov_mod because, with monin_obukhov_stable_mix being converted from a subroutine to an interface, arrays with mismatched ranks can no longer be passed directly.

How Has This Been Tested?
Builds with Intel on the AMD box

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• New check tests, if applicable, are included
• make distcheck passes