[binder] Add support for dump transaction to Rust

Allow Rust Binder services to define a handler for dump transactions.
Binder services that want to handle this special transaction should
override the dump method in Interface, otherwise dump transactions will
be a no-op.

Test: atest rustBinderTest
Bug: 190174171
Change-Id: Ib87ca09a8f7b8eda08f8a1bf59ad8066ea93d5a9