Changes to Get chat participants by recipient group. Roles: group manager, group member.

added the optional property groupMembers/items/group/groupType/externalReferenceId to the response with the 200 status

added the optional property groupMembers/items/groupRole/externalReferenceId to the response with the 200 status

added the optional property error/errorId to the response with the 400 status

added the optional property error/errorId to the response with the 401 status

added the optional property error/errorId to the response with the 403 status

added the optional property error/errorId to the response with the 404 status

added the optional property error/errorId to the response with the 500 status