message: [model] Add ext_println bindings for the model layer
diff: @@ -132,4 +132,13 @@ impl EnvHandler {
  {
  env::r#return(val)
  }
  +
  + /// Prints the given content.
  + ///
  + /// # Note
  + ///
  + /// Only usable in development (`--dev`) chains.
  + pub fn println(&self, content: &str) {
  + env::println(content)
  + }
  }
  