3-d spherical regridding and regridding to DSG feature types

[davidhassell]

Fixes #715 and #716

Notes

• dask_regrid.py: Added axis logic to cope with regridding 3-d input data to 1-d output data
• data.py: Fix bug when calculating output chunksizes
• field.py: Extend API for vertical regridding keyword parameters
• regrid.py:
  • Extend API for vertical regridding keyword parameters
  • Extended Grid dataclass for locstream and vertical regridding parameters
  • Added functionality to infer grids from DSG featureType fields
  • Refactored the creation of esmpy.Grid instances so that 3-d spherical grids are included without any extra special treatment
  • Added the createion of esmpy.Locstream instances
  • Added extra information to output weights filess (following what ESMF itself does)
  • regridoperator.py: Included parameters for vertical and DSG regridding

[sadielbartholomew]

Thanks for the notes for review David. Is this ready for review now or shall I wait?

[davidhassell]

Good to go ...