code: @NotNull
      @ObjectiveCName("findUsersCommandWithQuery:")
      public Command<UserVM[]> findUsers(String query) {
          return callback -> modules.getContactsModule().findUsers(query)
                  .then(v -> callback.onResult(v))
                  .failure(e -> callback.onError(e));
      }
docs: Find Users
  
  @param query query for search
  @return Command for execution