tone down debugs from codec modules

Author: Louis Thiery

src/codec/framed_read.rs

@@ -401,7 +401,7 @@ where
                 partial,
                 bytes,
             )? {
-                tracing::debug!(?frame, "received");
+                tracing::trace!(?frame, "received");
                 return Poll::Ready(Some(Ok(frame)));
             }
         }

src/codec/framed_write.rs

@@ -210,7 +210,7 @@ where
         let span = tracing::trace_span!("FramedWrite::buffer", frame = ?item);
         let _e = span.enter();
 
-        tracing::debug!(frame = ?item, "send");
+        tracing::trace!(frame = ?item, "send");
 
         match item {
             Frame::Data(mut v) => {