code: @NotNull
      @ObjectiveCName("transferOwnershipWithGid:withUid:")
      public Promise<Void> transferOwnership(int gid, int uid) {
          return modules.getGroupsModule().transferOwnership(gid, uid);
      }
docs: Transfer ownership of group
  
  @param gid group's id
  @param uid user's id
  @return Promise of void