[binder_rs] Add get_declared_instances and is_declared APIs

Adds the service manager get_declared_instancesa and is_declared methods
to the Rust Binder crate.

Test: rustBinderTest
Bug: None
Change-Id: If9b8a7eeacd164e254bd943bf0a2aec4d5c257e5
diff --git a/libs/binder/rust/src/lib.rs b/libs/binder/rust/src/lib.rs
index 1d7de98..dbfb1c2 100644
--- a/libs/binder/rust/src/lib.rs
+++ b/libs/binder/rust/src/lib.rs
@@ -114,8 +114,8 @@
 };
 pub use parcel::{ParcelFileDescriptor, Parcelable, ParcelableHolder};
 pub use proxy::{
-    get_interface, get_service, wait_for_interface, wait_for_service, DeathRecipient, SpIBinder,
-    WpIBinder,
+    get_declared_instances, get_interface, get_service, is_declared, wait_for_interface,
+    wait_for_service, DeathRecipient, SpIBinder, WpIBinder,
 };
 pub use state::{ProcessState, ThreadState};