Connect TEMPO microphysics to CCPP

[AndersJensen-NOAA]

Development of the Thompson-Eidhammer microphysics is transitioning to a submodule, and this submodule is: https://github.com/NCAR/TEMPO

TEMPO stand for Thompson-Eidhammer Microphysics Parameterization for Operations.

The use of a submodule will enable centralized community development (and testing) of the microphysics scheme for various applications and dynamical cores. This submodule will eventually replace the Thompson parameterization currently in the CCPP after approval from all parties involved and significant testing.

[dustinswales]

@AndersJensen-NOAA Thanks for all of your hard work to generalize and centralize this scheme.

As you've proposed, I think it's a good idea to implement TEMPO alongside the preexisting Thompson MP scheme. This will allow the TEMPO development to occur w/o breaking/interfering with the existing Thompson scheme.

In the end, I expect that we will remove the legacy version of Thompson MP and use TEMPO. TEMPO should have only bitwise differences wrt the legacy Thompson MP scheme. We introduced CCPP constants and parameterized working precision, so there will be numerical differences, but scientifically equivalent. You, myself and @RuiyuSun should work together to reach this conclusion before we decide to switch to the new code base. This will require some T&E, which I can help with.