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ENH: keepdims=True for xarray reductions (#3033)

* ENH: keepdims=True for xarray reductions

Addresses #2170

Add new option `keepdims` to xarray reduce operations, following the
behaviour of Numpy.

`keepdims` may be passed to reductions on either Datasets or DataArrays,
and will result in the reduced dimensions being still present in the
output with size 1.

Coordinates that depend on the reduced dimensions will be removed from
the Dataset/DataArray

* Set the default to be `False`

* Correct lint error

* Apply suggestions from code review

Co-Authored-By: Maximilian Roos <5635139+max-sixty@users.noreply.github.com>

* Add test for dask and fix implementation

* Move 'keepdims' up to where 'dims' is set

* Fix lint, add test for scalar variable

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