Purpose

This PR adds driver-in/out checkpointer. Currently also supports non orchestrated backends and only tested using numpy.

Code changes:

• checkpoint: added checkpoint selector to expose checkpoint type to driver
• driver: added checkpointer_config to driver config, defaults to NullCheckpointer
• grid and initialization: for serialbox type, add option to read the netcdf file
• fv_dynamics: add checkpoint driver-in
• update_atmos_state: add checkpoint driver-out
• test_checkpoints: add test_driver driver-in/out checkpoint

Infrastructure changes:

• driver checkpoint test added
• added all folder for c12_6ranks_baroclinic_dycore_microphysics which combines all savepoint netcdf to one folder

Checklist

Before submitting this PR, please make sure:

• You have followed the coding standards guidelines established at Code Review Checklist.
• Docstrings and type hints are added to new and updated routines, as appropriate
• All relevant documentation has been updated or added (e.g. README, CONTRIBUTING docs)
• For each public change and fix in pace-util, HISTORY has been updated
• Unit tests are added or updated for non-stencil code changes