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JoinGroupRequest => GroupId SessionTimeout RebalanceTimeout MemberId GroupInstanceId ProtocolType GroupProtocols
  GroupId             => String
  SessionTimeout      => int32
  RebalanceTimeout    => int32
  MemberId            => String // removed
  GroupInstanceId     => String // removed
  ProtocolType        => String 
  GroupProtocols      => [Protocol MemberMetadata]
  Protocol            => String // removed
  MemberMetadata      => bytes  // removed
  JoinGroupMembers    => []JoinGroupRequestMember // new
 						   MemberId            => String // new
						   GroupInstanceId     => String // new
						   Protocol            => String // new

JoinGroupResponse => ThrottleTime ErrorCode GenerationId ProtocolName LeaderId MemberId Members
  ThrottleTime           => int16
  ErrorCode              => int16  // removed
  GenerationId           => int32
  ProtocolName           => String
  LeaderId               => String
  MemberId               => String // removed
  Members                => []JoinGroupResponseMember 	
							  MemberId         => String
                              GroupInstanceId  => String
                              Metadata         => bytes
  MemberJoinResponseList => []JoinGroupResult  // new
							  MemberInfo  => JoinGroupResponseMember // new	
							  ErrorCode   => int16 // new

public static AddMemberResult addMemberToGroupaddMembersToGroup(String groupId, list<String> groupInstanceIdsToAdd, AddMemberToGroupOptions options);