feat(core): Default encoding/decoding limits (#1335)

* feat(core): Default encoding/decoding limits

This PR adds new defaults for both client and server max
encoding/decoding message size limits. By default, the max message
decoding size is `4MB` and the max message encoding size is
`usize::MAX`.

This is follow up work from https://github.com/hyperium/tonic/pull/1274

BREAKING: Default max message encoding/decoding limits

* update generated code

tests/integration_tests/src/lib.rs

@@ -53,3 +53,9 @@ pub mod mock {
         }
     }
 }
+
+pub fn trace_init() {
+    let _ = tracing_subscriber::FmtSubscriber::builder()
+        .with_env_filter(tracing_subscriber::EnvFilter::from_default_env())
+        .try_init();
+}