Add array_namespace property for each data object

[sandorkertesz]

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

The idea is to add a property to data objects to access the earthkit-utils patched array namespace of the objects. E.g.:

ds = ekd.from_source(f, "my.grib")
ds.array_namespace
ds[0].array_namespace

For Xarray it should be available on the earthkit accessor:

r = ds.to_xarray()
r.earthkit.array_namespace

Questions:

• do we need this property/method on the object? We could always use the array_namespace method in earthkit-utils:

from earthkit.utils import array_namespace
array_namespace(ds)
array_namespace(ds[0])
array_namespace(r)

• use a method with arguments? With a method we could pass options for compound datatypes such as fieldlist/Xarray e.g. to check all fields/variables or just the first one.
• use a private property '_array_namespace`?
• add array_backend too? We can get the namespace from the backend as array_backend.namesapce

Describe the solution you'd like

No response

Describe alternatives you've considered

No response

Additional context

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Organisation

ECMWF