Implement native TestClient shell

programs/src/bin/test_client.rs

@@ -1,5 +1,3 @@
 fn main() -> std::process::ExitCode {
-    let command_count = libremetaverse_programs::commands::TEST_CLIENT_COMMANDS.len();
-    eprintln!("TestClient command inventory contains {command_count} translated targets");
-    libremetaverse_programs::pending_program("TestClient")
+    libremetaverse_programs::test_client::main_entry()
 }

programs/src/lib.rs

@@ -7,5 +7,6 @@ pub mod osd_inspector;
 pub mod packet_dump;
 pub mod prim_inspector;
 pub mod simple_bot;
+pub mod test_client;
 
 pub use libremetaverse::shim::pending_program;