message: Add missing JetStream headers constants
diff: @@ -33,6 +33,12 @@ pub const NATS_LAST_SEQUENCE: &str = "Nats-Last-Sequence";
  /// Nats-Expected-Last-Subject-Sequence
  pub const NATS_EXPECTED_LAST_SUBJECT_SEQUENCE: &str = "Nats-Expected-Last-Subject-Sequence";
  +/// Message identifier used for deduplication window
  +pub const NATS_MESSAGE_ID: &str = "Nats-Msg-Id";
  +/// Last expected message ID for JetStream message publish
  +pub const NATS_EXPECTED_LAST_MESSAGE_ID: &str = "Nats-Expected-Last-Msg-Id";
  +/// Last expected sequence for JetStream message publish
  +pub const NATS_EXPECTED_LAST_SEQUENCE: &str = "Nats-Expected-Last-Sequence";
  /// A struct for handling NATS headers.
  /// Has a similar API to [http::header], but properly serializes and desiaralizes
  