[Connection Manager] Expose AddressWithType over FFI

We create a simple AddressWithType object shared between C++ and Rust.
We can't reuse any of the existing types, since the GD AddressWithType
has a vtable and so does not have Rust-compatible layout, and the
legacy tBLE_BD_ADDR has the wrong endianness.

Bug: 272572974
Test: compiles
Change-Id: I399bb1f232aeec4e7f2b635aef0f050bf5efb356