ndk: Add AMidi interface #1561

Job	Run time
Check overall MSRV (1.64.0)	1m 54s
Check ndk-sys MSRV (1.60.0)	1m 40s
Host-side tests (ubuntu-latest, stable)	34s
Host-side tests (ubuntu-latest, nightly)	32s
clippy	34s
Cross-compile (ubuntu-latest, stable, armv7-linux-androideabi, armeabi-v7a)	1m 29s
Cross-compile (ubuntu-latest, stable, aarch64-linux-android, arm64-v8a)	1m 40s
Cross-compile (ubuntu-latest, stable, i686-linux-android, x86)	1m 43s
Cross-compile (ubuntu-latest, stable, x86_64-linux-android, x86_64)	1m 32s
Cross-compile (ubuntu-latest, nightly, armv7-linux-androideabi, armeabi-v7a)	2m 10s
Cross-compile (ubuntu-latest, nightly, aarch64-linux-android, arm64-v8a)	2m 2s
Cross-compile (ubuntu-latest, nightly, i686-linux-android, x86)	1m 46s
Cross-compile (ubuntu-latest, nightly, x86_64-linux-android, x86_64)	1m 57s
Cross-compile (windows-latest, stable, aarch64-linux-android, arm64-v8a)	4m 54s
Cross-compile (windows-latest, stable, x86_64-linux-android, x86_64)	4m 14s
Build-test docs (ubuntu-latest, stable)	34s
Build-test docs (ubuntu-latest, nightly)	33s
formatting	19s
	30m 7s

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