Needed state on Field

Field:

• name -> needed
• data -> needed
• grid -> needed
• _interp_method -> needed
• igrid -> needed
• _parent_mesh -> Remove. gives indication of the model its coming from. Unstructured specific? Can be determined from the attrs dict.
• _location -> Tells us if face, node, edge registered (uxarray). Remove in favor of data.attrs['location']
• _vertical_location -> remove in favor of data.attrs....
• _mesh_type -> can be removed down the line
• units -> Keep for now. Can likely be removed down the line. Nick thinks that this can just be removed from the codebase to a large extent where _mesh_type is picked up from attrs (based on units of lon/lat), and units for the variables are picked up. If units are degrees, a dask operation can be done to convert (Nick to investigate where unit converters are usd in the codebase).
• allow_time_extrapolation -> needed? Let's remove entirely? Joe posted issue
  • if its a single timeslice, then we can extrapolate the time
  • otherwise, just use the provided time domain. Users (if they want extrapolation, or periodic looping of their simulation) can use xarray methods to create their dataset of interest (xr.concat etc.). Q:Does xr.concat actually increase the size of the dataset if you concat multiple of the same dataset? Or does it just create pointers to the same location?
• _spatialhash -> get rid of (opt fordata.uxgrid.spatial_hash is None etc.... and calculate on the fly)
• _gtype -> via GridAdapter (if need be)
• _lonlat_minmax -> via GridAdapter (if need be)