Missing plotting support for gridType="lambert"

[uandrae]

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

The plotting, as in quickplot() works well for gridtype lambert_lam whereas the pure lambert projection, https://codes.ecmwf.int/grib/format/grib2/templates/3/30/, returns the following error

File .../lib/python3.10/site-packages/earthkit/data/core/fieldlist.py:336, in Field.to_points(self, flatten, dtype, index)
    334     return dict(x=lon, y=lat)
    335 else:
--> 336     raise ValueError("to_points(): geographical coordinates in original CRS are not available")
    338 # convert values to array format
    339 assert r

ValueError: to_points(): geographical coordinates in original CRS are not available

Applying grib_set -s gridType=lambert_lam on the same file makes the plotting work.

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