add Operators
Add operators to the channel. See [
https://docs.sendbird.com/platform/user_type#3_operator](https://docs.sendbird.com/platform/user_type#3_operator) for the explanations on the operators.
Since
3.0.137
Parameters
user Ids
user ids to add as operators. If empty or null, SendbirdException with error code {@value com.sendbird.android.exception.SendbirdError#ERR_INVALID_PARAMETER} is passed to the handler.
handler
handler to register