Add a CLI to create new Parcel apps #4255

Job	Run time
TypeScript types	1m 42s
Lint	1m 16s
Flow	1m 4s
Benchmarks	11m 34s
Integration tests (ubuntu-latest, Node 18)	9m 16s
Build REPL	7m 22s
Integration tests (macos-latest, Node 18)	10m 13s
Unit tests (ubuntu-latest, Node 18)	3m 1s
Integration tests (windows-latest, Node 18)	20m 56s
Unit tests (macos-latest, Node 18)	2m 46s
Unit tests (windows-latest, Node 18)	13m 41s
Integration tests (ubuntu-latest, Node 20)	8m 44s
Unit tests (ubuntu-latest, Node 20)	3m 0s
Unit tests (macos-latest, Node 20)	2m 47s
Integration tests (macos-latest, Node 20)	8m 51s
Unit tests (windows-latest, Node 20)	14m 10s
Integration tests (windows-latest, Node 20)	24m 25s
	2h 24m 48s

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