Fix response tracing for streaming response bodies (#514)

* Fix response tracing for streaming response bodies

* Log everything except for the streaming body for streaming responses

rust-runtime/smithy-http/src/middleware.rs

@@ -77,11 +77,10 @@ where
     O: ParseHttpResponse<SdkBody, Output = Result<T, E>>,
 {
     if let Some(parsed_response) = handler.parse_unloaded(&mut response) {
+        trace!(response = ?response);
         return sdk_result(parsed_response, response);
     }
 
-    trace!(response = ?response);
-
     let (parts, body) = response.into_parts();
     let body = match read_body(body).await {
         Ok(body) => body,
@@ -94,6 +93,7 @@ where
     };
 
     let response = Response::from_parts(parts, Bytes::from(body));
+    trace!(response = ?response);
     let parsed = handler.parse_loaded(&response);
     sdk_result(parsed, response.map(SdkBody::from))
 }