Add match grouping by spans and set this as default output type #366

Job	Run time
test py3.8 on ubuntu-latest	1m 26s
upload test coverage to codecov	0s
test py3.8 on windows-latest	2m 8s
test py3.8 on macOS-latest	2m 27s
test py3.9 on ubuntu-latest	2m 50s
test py3.9 on windows-latest	2m 14s
test py3.9 on macOS-latest	31s
test py3.10 on ubuntu-latest	40s
test py3.10 on windows-latest	4m 2s
test py3.10 on macOS-latest	2m 50s
	19m 8s

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