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

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

LeaveGroupRequest => GroupId MemberIdentityList
  GroupId             => String
  MemberId            => String // removed
  MemberIdentityList  => List[Tuple[String, String]] // new