Add ParallelEnumerate and Enumerate #251

Job	Run time
pack	2m 6s
test-parsers (ubuntu-latest, Debug)	3m 58s
build (ubuntu-latest, Debug)	1m 6s
test-parsers (ubuntu-latest, Release)	3m 56s
build (ubuntu-latest, Release)	49s
test-parsers (windows-latest, Debug)	5m 28s
build (windows-latest, Debug)	3m 7s
test-parsers (windows-latest, Release)	6m 6s
build (windows-latest, Release)	2m 22s
test-parsers (macos-latest, Debug)	7m 48s
build (macos-latest, Debug)	1m 4s
test-parsers (macos-latest, Release)	3m 36s
build (macos-latest, Release)	1m 4s
create-release-push	0s
	42m 30s

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