newRequestingMembers

Represents users that have requested to join the group via the group link. Note that members requesting to join might not necessarily have the list of users in the group, so they won't be able to send a peer-to-peer group update message to inform users of their request to join. Other users in the group may inform us that the revision has increased, but the members requesting access will have to be obtained from the server instead (which signald will handle). For now, a get_group request has to be made to get the users that have requested to join the group.