Speciification of spinup-restart and spinup-translator

[ma595]

Initial specification of nemo-spinup-restart:

• Basic functionality to get restart file from ml predictions (.npy). Incorporating restart.py file with tests.
• Regrid restart file (upscaling / downscaling) if we have downscaled or upscaled previously.
• What to do with velocities - reproduce by computing Geostrophic velocities or not...

Data dependencies:

• reference restart file coarse
• reference restart file fine
• mesh_mask coarse
• mesh_mask fine
• name_list (we only need one in order to get eos info - timestep can be obtained from reference original restart file)
• domain_cfg_out.nc

Minimal requirements:

• 2 restart templates (coarse, fine)
• 2 mesh_mask files (coarse, fine) - for tmask only
• 1 coarse/fine namelist - for EOS parameters.

Basic implementation will only work for NEMO / DINO.

Specification of translator toolbox:

• generic suite of operations that can work on different models.
• a hub to resuffle data and bring in new information
• Regridding upscaling / downscaling. Utilise ESMF functions

Choose which variables to use when:

• velocities - assume velocity zero (temp and salinity only)
• account for different timestepping veariables - before (b) now (n) when translating.

Edge cases:

[dorchard]

Possible alternate name: restart-translator?