Add support for 1D NetCDF data

[sandorkertesz]

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

No response

Describe the solution you'd like

t2_prec_obs.nc is a NetCDF file containing 1D data (e.g. observations), but from_source fails to load it:

ds = earthkit.data.from_source("file", "t2_prec_obs.nc")

Log:

 Earthkit log: Exception: NetCDFReader no 2D fields found in t2_prec_obs.nc

The task is to add support for NetCDF with 1D data.

Describe alternatives you've considered

No response

Additional context

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Organisation

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