Add `_datasets.utils.from_xarray_dataset_dict()` #1438

Job	Run time
py3.11 \| ubuntu \| unit tests	5m 11s
py3.12 \| ubuntu \| unit tests	5m 32s
py${{ matrix.python-version }} \| ${{ matrix.os }} \| integration tests	0s
mypy	0s
merge-test-artifacts	-1s
	10m 42s

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