Includes rust_binary in rust-project.json

Until now, only rust_library (and their derivatives such as
rust_library_host) were reported in rust-project.json. Adds support for
rust_binary and rust_tests.

Bug: 174743191
Test: Validate auto-completion in keystore2_main.rs
Change-Id: I17b3ec29e233f29b7abd16dc771070ada48d17fb