Adding external land component support for FV3

[uturuncoglu]

Description

The existing implementation only allows to run land component internally through the used of CCPP/physics. To allow interaction with the external land component FV3 and its coupling interface need to be extended.

Solution

Make required changes in the coupling interface as well as CCPP/physics to allow interaction with the external land component.

Alternatives

No

Testing:

1. Have you tested the code changes? On what platforms?
   The existing implementation is tested under UFS Weather Model on NCAR2s Cheyenne platform using both GNU and INTEL compilers.
2. Have you run regression test in ufs-weather-model or ufs-s2s-model with code changes? Yes

• Will the baseline results change? No
• If yes, please give brief explanation of your code updates on the regression test.

Dependent PRs:

Directly reference any issues or PRs in this or other repositories that this is related to, and describe how they are related. Example:

• [Bring external land model support NCAR/ccpp-physics#970] - it is required to provide information the the external land component