[On-hold] Rossby Test Case Initialization + Example Config

[jjuyeonkim]

Description

This PR contains some initial steps in porting a Fortran shallow water test to pace. This PR will test DycoreState initialization for the Rossby-Haurwitz wave 4 test case found in tools/test_cases.F90 (shallow-water test 6) of the GFDL_atmos_cubed_sphere repo. It also contains an example configuration yaml with a new boolean parameter sw_dynamics in the Dycore configuration.

This PR is dependent on PyFV3 #50 and NOAA-GFDL/NDSL#136

Fixes # (issue)
None.

How Has This Been Tested?
There's a new unit test that uses net-cdf files generated from the SHiELD as ground truth for the initialized DycoreState. It can be run in the following way:

pytest -vsx tests/main/fv3core/test_dycore_rossby_init.py

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 - Not applicable
• My changes generate no new warnings - There are some new warnings (division by 0) in the unit test.
• Any dependent changes have been merged and published in downstream modules - This PR is dependent on PyFV3 #50 and Adding sw_dynamics to NamelistDefaults NDSL#136
• New check tests, if applicable, are included