muteAllTeamMember method Null safety
Mute all group members.
Mute all group members. Only the group owner and group admins have permission for the operation.
teamId The group ID
mute true: mute, false: unmute
Implementation
Future<NIMResult<void>> muteAllTeamMember(String teamId, bool mute) async {
  return _platform.muteAllTeamMember(teamId, mute);
}