Deletion Detection

When using end-to-end encryption, relays cannot modify encrypted payloads but could selectively delete or withhold objects. [MoQTransport] defines PRIOR_GROUP_ID_GAP and PRIOR_OBJECT_ID_GAP properties that publishers can include to indicate intentional gaps in sequences. Subscribers can use these to distinguish between publisher-intended gaps and potential relay deletion. [SecureObjects] provides additional mechanisms for detecting such attacks.