add Curves.Edwards.TwistIsomorphism (#1844) #829

Job	Run time
install (dev, 4.11.1, Ubuntu, ubuntu-latest)	38m 50s
install (dev, 4.11.1, macOS, macos-latest)	48m 1s
install (dev, 4.11.1, Windows, windows-latest, -async-proofs-j 1, opam-repository-mingw: https://...	1h 32m 48s
install (8.19.0, 4.11.1, Ubuntu, ubuntu-latest)	38m 20s
install (8.19.0, 4.11.1, macOS, macos-latest)	1h 10m 50s
install (8.19.0, 4.11.1, Windows, windows-latest, -async-proofs-j 1, opam-repository-mingw: https...	1h 30m 34s
install (8.18.0, 4.11.1, Ubuntu, ubuntu-latest)	40m 50s
install (8.18.0, 4.11.1, macOS, macos-latest)	43m 48s
install (8.18.0, 4.11.1, Windows, windows-latest, -async-proofs-j 1, opam-repository-mingw: https...	1h 35m 40s
	9h 19m 41s

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