message: Mark IbcAcknowledgement non_exhaustive
diff: @@ -185,6 +185,7 @@ pub struct IbcPacket {
  }
  #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)]
  +#[non_exhaustive]
  pub struct IbcAcknowledgement {
  pub data: Binary,
  // we may add more info here in the future (meta-data from the acknowledgement)
  