Add IntoRawHandle impl for FFI ownership transfer #420

Job	Run time
cargo-deny (advisories)	15s
lint	26s
cargo-deny (bans licenses sources)	16s
aarch64-apple-ios / build	25s
aarch64-apple-darwin / build	23s
aarch64-apple-darwin-nightly / build	37s
aarch64-unknown-linux-gnu / build	38s
aarch64-unknown-linux-musl / build	47s
arm-linux-androideabi / build	21s
armv7-linux-androideabi / build	33s
i686-pc-windows-gnu / build	1m 8s
i686-pc-windows-msvc / build	1m 19s
i686-unknown-linux-gnu / build	29s
i686-unknown-linux-musl / build	1m 5s
msrv-aarch64-apple-darwin / build	33s
msrv-arm-linux-androideabi / build	43s
msrv-x86_64-pc-windows-msvc / build	50s
msrv-x86_64-unknown-freebsd / build	39s
msrv-x86_64-unknown-linux-gnu / build	41s
msrv-x86_64-unknown-linux-musl / build	41s
x86_64-apple-darwin / build	40s
msrv-x86_64-unknown-netbsd / build	31s
x86_64-pc-windows-gnu / build	3m 20s
x86_64-pc-windows-msvc / build	2m 21s
x86_64-pc-windows-msvc-nightly / build	2m 8s
x86_64-unknown-freebsd / build	24s
x86_64-unknown-linux-gnu / build	1m 4s
x86_64-unknown-linux-gnu-nightly / build	39s
x86_64-unknown-linux-musl / build	50s
x86_64-unknown-netbsd / build	24s
	25m 10s

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