Convert loads module to xarray #699

Job	Run time
set-os	1s
check-changes	14s
prepare-cache	3m 13s
hindcast-${{ matrix.os }}/${{ matrix.python-version }}	0s
pip-ubuntu-latest/3.8	17m 55s
conda-ubuntu-latest/3.8	17m 30s
pip-ubuntu-latest/3.9	16m 59s
conda-ubuntu-latest/3.9	15m 59s
pip-ubuntu-latest/3.10	17m 0s
conda-ubuntu-latest/3.10	18m 50s
pip-ubuntu-latest/3.11	17m 0s
conda-ubuntu-latest/3.11	16m 39s
Indicate completion to coveralls.io	15s
	2h 21m 35s

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