Introduced module imports for dimensions

[nfarabullini]

removed local definition of dimensions and introduced module import -->

From:

# TODO: this will have to be removed once domain allows for imports
EdgeDim = dims.EdgeDim
KDim = dims.KDim

@field_operator
def _field_op(
	fields..,
        out=out,
        domain={
            EdgeDim: (horizontal_start, horizontal_end),
            KDim: (vertical_start, vertical_end),
        },
    )

To:

@field_operator
def _field_op(
	fields..,
        out=out,
        domain={
            dims.EdgeDim: (horizontal_start, horizontal_end),
            dims.KDim: (vertical_start, vertical_end),
        },
    )

[github-actions]

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[nfarabullini]

cscs-ci run default

[nfarabullini]

launch jenkins spack

[egparedes]

LGTM.

Note to myself: maybe in the future we could consider renaming the dimension symbols to drop the Dim suffix, since the name already contains dims in the module part...