Generator now adds client thread and process ids headers

This step prepares for the client stack capture support implementation for the proxide proxy. The goal is for proxide to capture the callstacks of the threads of client process when the traffic from the client goes through the proxide. This enables analysis of the client application behavior when unexpected calls pass through the proxy. Functionality will be available when the proxide proxy is on the same host machine as the client.

test/rust_grpc/src/generator.rs

@@ -235,5 +235,7 @@ pub fn get_current_native_thread_id() -> i64
     return os_id::thread::get_raw_id() as i64;
 
     #[cfg(target_os = "windows")]
-    unsafe {return windows::Win32::System::Threading::GetCurrentThreadId() as i64; }
+    unsafe {
+        return windows::Win32::System::Threading::GetCurrentThreadId() as i64;
+    }
 }