Align xarray dimension handling in `to_xarray` with earthkit-data

[andreas-grafberger]

Is your feature request related to a problem? Please describe.

earthkit-data tries to establish conventions for the handling of xarray dataset dimensions that are followed by many data sources (or rather, readers). Those can be found here: https://earthkit-data.readthedocs.io/en/latest/guide/xarray/dim.html#xr-dim

Ideally, the earthkit-data polytope source (which wraps covjsonkit) would also align with these conventions.

This would mean that we could e.g. load reanalysis data into a dataframe with a single valid_time dimension, or load forecast data to have forecast_reference_time and step dimensions.

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