Add packaging for standalone files (#1710) #701

Job	Run time
install (dev, 4.11.1, ubuntu-latest)	1h 12m 12s
install (dev, 4.11.1, macos-latest)	1h 4m 11s
install (dev, 4.11.1, windows-latest, opam-repository-mingw: https://github.com/ocaml-opam/opam-r...	2h 12m 35s
install (8.18.0, 4.11.1, ubuntu-latest)	58m 37s
install (8.18.0, 4.11.1, macos-latest)	48m 7s
install (8.18.0, 4.11.1, windows-latest, opam-repository-mingw: https://github.com/ocaml-opam/opa...	2h 38m 29s
install (8.17.0, 4.11.1, ubuntu-latest)	1h 14m 14s
install (8.17.0, 4.11.1, macos-latest)	49m 7s
install (8.17.0, 4.11.1, windows-latest, opam-repository-mingw: https://github.com/ocaml-opam/opa...	1h 41m 33s
	12h 39m 5s

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