Add ParallelEnumerate and Enumerate #242

Job	Run time
pack	1m 58s
test-parsers (ubuntu-latest, Debug)	4m 25s
build (ubuntu-latest, Debug)	1m 39s
test-parsers (ubuntu-latest, Release)	4m 17s
build (ubuntu-latest, Release)	1m 30s
test-parsers (windows-latest, Debug)	5m 52s
build (windows-latest, Debug)	2m 43s
test-parsers (windows-latest, Release)	5m 51s
build (windows-latest, Release)	2m 40s
test-parsers (macos-latest, Debug)	11m 2s
build (macos-latest, Debug)	1m 26s
test-parsers (macos-latest, Release)	5m 42s
build (macos-latest, Release)	2m 6s
create-release-push	0s
	51m 11s

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