feat: allow conversions using ptr on the ffi #796

Job	Run time
Build (x86_64-pc-windows-msvc)	9m 35s
Build (aarch64-pc-windows-msvc)	11m 17s
Build (x86_64-apple-darwin)	7m 51s
Build (aarch64-apple-darwin)	5m 17s
Build (aarch64-apple-ios)	9m 16s
Build (aarch64-apple-ios-sim)	7m 4s
Build (x86_64-unknown-linux-gnu)	6m 53s
Build (aarch64-unknown-linux-gnu)	4m 46s
Build (aarch64-linux-android)	7m 23s
Build (armv7-linux-androideabi)	7m 23s
Build (x86_64-linux-android)	6m 24s
	1h 23m 9s

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