refactor: `storage` is not a sub-package of `persistence` - Moved classes

[demos/kafka/chat] / src / main / java / de / juplo / kafka / chat / backend / storage / mongodb / MessageRepository.java

package de.juplo.kafka.chat.backend.persistence.storage.mongodb;

import org.springframework.data.mongodb.repository.MongoRepository;

import java.util.List;


public interface MessageRepository extends MongoRepository<MessageTo, String>
{
  List<MessageTo> findByChatRoomIdOrderBySerialAsc(String chatRoomId);
}