Add IntoRawHandle impl for FFI ownership transfer #418

Job	Run time
cargo-deny (advisories)	25s
lint	1m 14s
cargo-deny (bans licenses sources)	25s
aarch64-apple-darwin / build	43s
aarch64-apple-darwin-nightly / build	1m 21s
aarch64-apple-ios / build	53s
aarch64-unknown-linux-gnu / build	39s
aarch64-unknown-linux-musl / build	53s
armv7-linux-androideabi / build	36s
arm-linux-androideabi / build	28s
i686-pc-windows-gnu / build	2m 34s
i686-pc-windows-msvc / build	3m 9s
i686-unknown-linux-gnu / build	32s
i686-unknown-linux-musl / build	1m 18s
msrv-aarch64-apple-darwin / build	2m 21s
msrv-arm-linux-androideabi / build	2m 43s
msrv-x86_64-pc-windows-msvc / build	3m 7s
msrv-x86_64-unknown-freebsd / build	2m 14s
msrv-x86_64-unknown-linux-gnu / build	2m 26s
msrv-x86_64-unknown-linux-musl / build	2m 25s
msrv-x86_64-unknown-netbsd / build	2m 11s
x86_64-pc-windows-gnu / build	3m 40s
x86_64-apple-darwin / build	41s
x86_64-pc-windows-msvc / build	2m 24s
x86_64-pc-windows-msvc-nightly / build	2m 9s
x86_64-unknown-freebsd / build	26s
x86_64-unknown-linux-gnu / build	49s
x86_64-unknown-linux-gnu-nightly / build	57s
x86_64-unknown-netbsd / build	41s
x86_64-unknown-linux-musl / build	50s
	45m 14s

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