ANDROID: rust_binder: add BINDER_TYPE_FD support

Add support for sending fds over binder.

Unlike the other object types, file descriptors are not translated until
the transaction is actually received by the recipient. Until that
happens, we store `u32::MAX` as the fd.

Translating fds is done in a two-phase process. First, the file
descriptors are allocated and written to the allocation. Then, once we
have allocated all of them, we commit them to the files in question.
Using this strategy, we are able to guarantee that we either send all of
the fds, or none of them.

Link: https://lore.kernel.org/rust-for-linux/20231101-rust-binder-v1-13-08ba9197f637@google.com/


Change-Id: Ia57fa9f732b7363c4a75fe49a48baef6ebfa8de2
Co-developed-by: Wedson Almeida Filho <wedsonaf@gmail.com>
Signed-off-by: Wedson Almeida Filho <wedsonaf@gmail.com>
Signed-off-by: Alice Ryhl <aliceryhl@google.com>
Bug: 278052745