rust: types: add `ARef::into_raw`

Add a method for `ARef` that is analogous to `Arc::into_raw`. It is the
inverse operation of `ARef::from_raw`, and allows you to convert the
`ARef` back into a raw pointer while retaining ownership of the
refcount.

This new function will be used by [1] for converting the type in an
`ARef` using `ARef::from_raw(ARef::into_raw(me).cast())`. Alice has
also needed the same function for other use-cases in the past, but [1]
is the first to go upstream.

This was implemented independently by Kartik and Alice. The two versions
were merged by Alice, so all mistakes are Alice's.

Link: https://lore.kernel.org/r/[email protected] [1]
Link: https://github.com/Rust-for-Linux/linux/issues/1044
Signed-off-by: Kartik Prajapati <[email protected]>
Co-developed-by: Alice Ryhl <[email protected]>
Signed-off-by: Alice Ryhl <[email protected]>
Reviewed-by: Benno Lossin <[email protected]>
[ Reworded to correct the author reference and changed tag to Link
  since it is not a bug. - Miguel ]
Signed-off-by: Miguel Ojeda <[email protected]>

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