Return single xr.Dataset from to_xarray #109
Description
Is your feature request related to a problem? Please describe.
NOTE: This issue came up when testing #104 and might be solved in conjunction.
to_xarray (in particular TimeSeries.to_xarray) currently returns a separate xarray dataset for each hdate when we retrieve reanalysis/reforecast datasets for multiple days.
Ideally, we'd have something similar to many earthkit-data sources, where we can get a single dataset with a valid_time (could be different name) dimension that exposes all data through one object.
Update: In tests we found out that we might want to extend the scope of this ticket to allow more general merging of different coverages into a single xarray dataset. This is not only useful for hdates but also when we request multiple points in timeseries, etc. (as this currently causes multiple datasets to be returned).
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