ANDROID: rust_binder: add BINDER_TYPE_FDA support

In the previous patch, we introduced support for `BINDER_TYPE_FD`
objects that let you send a single fd, and in this patch, we add support
for FD arrays. One important difference between `BINDER_TYPE_FD` and
`BINDER_TYPE_FDA` is that FD arrays will close the file descriptors when
the transaction allocation is freed, whereas FDs sent using
`BINDER_TYPE_FD` are not closed.

Note that `BINDER_TYPE_FDA` is used only with hwbinder.

Link: https://lore.kernel.org/rust-for-linux/20231101-rust-binder-v1-14-08ba9197f637@google.com/


Change-Id: I0b50e440c957fba5b1adb5b53f82bce3e1f1e0e7
Signed-off-by: Alice Ryhl <aliceryhl@google.com>
Bug: 278052745