Prevent handling redeclared methods as query methods

Currently all query methods not carrying an @Query annotation are considered a query method to be validated. However, it is possible the user's repository interface re-declares methods of CrudRepository to reconfigure e.g. transaction configuration. Thus, a repository interface like this is valid:

interface UserRepository extends Repository<User, Long> {

  User save(User user);
}

The save(…) method must not be considered a query method actually as it will be implemented by the store specific repository implementation.