bring CoreMIDI back to visionos #38

Job	Run time
macos-docs	1m 38s
cargo-publish	0s
macos-test (stable)	1m 35s
ios-check (stable, aarch64-apple-ios)	1m 19s
macos-test (nightly)	1m 31s
ios-check (stable, x86_64-apple-ios)	2m 38s
visionos-check (aarch64-apple-visionos)	47s
ios-check (stable, aarch64-apple-ios-sim)	1m 22s
visionos-check (aarch64-apple-visionos-sim)	1s
ios-check (nightly, aarch64-apple-ios)	1m 52s
ios-check (nightly, x86_64-apple-ios)	1m 38s
ios-check (nightly, aarch64-apple-ios-sim)	1m 23s
	15m 44s

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