Added missing derives from publisher handle

examples/publish_complex_msgs.rs

@@ -46,8 +46,7 @@ fn main() -> Result<(), Error> {
 
     // run for 10 seconds
     let mut count = 0;
-    // while count < 100 {
-    loop {
+    while count < 100 {
         node.spin_once(std::time::Duration::from_millis(100));
         count += 1;
     }

src/lib.rs

@@ -350,6 +350,7 @@ where
 unsafe impl<T> Send for Publisher<T> where T: WrappedTypesupport {}
 
 use std::sync::{Arc, Mutex, Weak};
+#[derive(Debug, Clone)]
 pub struct Publisher<T>
 where
     T: WrappedTypesupport,
@@ -359,6 +360,7 @@ where
 }
 
 unsafe impl Send for PublisherUntyped {}
+#[derive(Debug, Clone)]
 pub struct PublisherUntyped {
     handle: Weak<rcl_publisher_t>,
     type_: String,