agent: clear module_inception/type_complexity warnings

To clear these two warnings, this commit did changes:

- add `#![allow(clippy::module_inception)]` to target files
- use type alias for tuple of `(MessageHeader, Vec<u8>)`

Signed-off-by: bin liu <bin@hyper.sh>

src/agent/src/rpc.rs

@@ -1663,13 +1663,12 @@ mod tests {
     use std::sync::mpsc::{Receiver, Sender};
     use ttrpc::{MessageHeader, TtrpcContext};
 
-    fn mk_ttrpc_context() -> (TtrpcContext, Receiver<(MessageHeader, Vec<u8>)>) {
+    type Message = (MessageHeader, Vec<u8>);
+
+    fn mk_ttrpc_context() -> (TtrpcContext, Receiver<Message>) {
         let mh = MessageHeader::default();
 
-        let (tx, rx): (
-            Sender<(MessageHeader, Vec<u8>)>,
-            Receiver<(MessageHeader, Vec<u8>)>,
-        ) = channel();
+        let (tx, rx): (Sender<Message>, Receiver<Message>) = channel();
 
         let ctx = TtrpcContext {
             fd: -1,

src/agent/src/test_utils.rs

@@ -2,6 +2,7 @@
 //
 // SPDX-License-Identifier: Apache-2.0
 //
+#![allow(clippy::module_inception)]
 
 #[cfg(test)]
 mod test_utils {