Request that uvRelativeToGrid GRIB key be read by default

[blaylockbk]

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

When working with wind vector data, it is important to know if the vectors represented are grid- or earth-relative vectors. To get this information, a user currently needs to explicitly read this GRIB key.

import xarray as xr

xr.open_dataset(
    "/path/to/file.grib2",
    engine="cfgrib",
    backend_kwargs={"read_keys": ["uvRelativeToGrid"]},
)

Since this detail is necessary when interpreting wind vectors (i.e., comparing modeled wind to an observation), I suggest this GRIB key be included in the DataArray attrs by default.

Describe the solution you'd like

If I'm right, I think this key can be simply added in the list here

cfgrib/cfgrib/dataset.py

Lines 40 to 48 in eacde4c

	DATA_ATTRIBUTES_KEYS = [
	"paramId",
	"dataType",
	"numberOfPoints",
	"typeOfLevel",
	"stepUnits",
	"stepType",
	"gridType",
	]

Describe alternatives you've considered

No response

Additional context

No response

Organisation

No response