Merge pull request #84 from scipp/print_matching_providers #249

Job	Run time
Formatting and static analysis	40s
Tests (ubuntu-20.04, mypy) / test	28s
Tests (ubuntu-20.04, py38) / test	21s
Tests (ubuntu-20.04, dask) / test	20s
docs / Build documentation	59s
	2m 48s

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