leaveGroup 
          suspend fun leaveGroup(groupID: String, leaveGroupType: LeaveGroupType = LeaveGroupType.LEAVE_ONLY): GroupInfo
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Leaves a group with the specified groupID.
https://github.com/signalapp/Signal-Desktop/blob/37d47764729d3cc6e8a8d9aeba1c0d2501549bcb/ts/models/conversations.ts#L2428
Parameters
leaveGroupType  
Other actions to perform when leaving a group. Defaults to just leaving the group without requesting that other devices block the group or delete its chat history.
Throws
if signald sends an error response or the incoming message is invalid
if the request to the socket fails