Add match grouping by spans and set this as default output type #367

Job	Run time
upload test coverage to codecov	1m 28s
test py3.8 on ubuntu-latest	1m 23s
test py3.8 on windows-latest	2m 50s
test py3.8 on macOS-latest	2m 38s
test py3.9 on ubuntu-latest	46s
test py3.9 on windows-latest	4m 2s
test py3.9 on macOS-latest	31s
test py3.10 on ubuntu-latest	2m 48s
test py3.10 on windows-latest	1m 51s
test py3.10 on macOS-latest	2m 48s
	21m 5s

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