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feat: `FlatList.Parallel` module with the vocabulary of the FSharp.Core `Array.Parallel` module #98

Job	Run time
build-devcontainer	2m 3s
build (Debug, macOS-latest)	1m 32s
build (Release, macOS-latest)	8m 47s
build (Debug, windows-latest)	2m 24s
build (Release, ubuntu-latest)	48s
build (Debug, ubuntu-latest)	49s
build (Release, windows-latest)	49s
	17m 12s