Add a kAFFE client option to enable the usage of AckFrequencyFrame, including (1) Send min_ack_delay from client. (2) Update client upon receiving AckFrequencyFrame. Separate options will enable actual sending of AckFrequencyFrame and is in follow-up CLs. PiperOrigin-RevId: 332049097 Change-Id: Ibc267ab580ce7ed5638fd2ad62226f67c1604a85