Add ParallelEnumerate and Enumerate #240

Job	Run time
pack	1m 45s
build (ubuntu-latest, Debug)	1m 3s
test-parsers (ubuntu-latest, Debug)	4m 8s
build (ubuntu-latest, Release)	49s
test-parsers (ubuntu-latest, Release)	4m 9s
test-parsers (windows-latest, Debug)	4m 33s
build (windows-latest, Debug)	2m 30s
test-parsers (windows-latest, Release)	5m 34s
build (windows-latest, Release)	2m 25s
test-parsers (macos-latest, Debug)	6m 25s
build (macos-latest, Debug)	1m 7s
test-parsers (macos-latest, Release)	6m 38s
build (macos-latest, Release)	57s
create-release-push	0s
	42m 3s

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