Add full typed MongoDB repository support to StorageAPI

[joordih]

Add a modern, type-safe MongoDB integration using POJOs with Jackson annotations and Lombok to reduce boilerplate. The new implementation provides a cleaner repository pattern while maintaining backward compatibility with the existing MongoStorage implementation.

What I changed

New package structure under xyz.refinedev.api.storage.mongo

• model.Model: Base interface for MongoDB entities with @JsonProperty("_id") mapping
• repository.ObjectRepository: Generic CRUD interface defining find, save, remove, and findAll operations
• repository.MongoObjectRepository: MongoDB implementation of ObjectRepository with typed collection support
• storage.MongoStorageManager: New recommended entrypoint with POJO codec registry configuration and typed repository creation
• storage.MongoStorage: Marked as @Deprecated and kept for backward compatibility with the Document+Gson approach

Example implementation (in src/test)

• User model

  • Implements Model interface
  • Uses Lombok annotations (@Getter, @Setter, @Builder, @NoArgsConstructor, @AllArgsConstructor)
  • Uses Jackson annotations (@JsonProperty("_id"), @JsonIgnore for computed fields)
  • Fields: id, uuid, points, level

• UserManager

  • Encapsulates repository access for User entities
  • Initialized with MongoStorageManager

• Storage main class

  • Shows a complete workflow: initialize MongoStorageManager, create UserManager, save and retrieve users

Why this is useful

• Type-safe: Work directly with POJOs instead of raw Document objects
• Less boilerplate: Lombok annotations eliminate repetitive getters/setters/builders
• Modern approach: Uses MongoDB's native POJO codec provider instead of Gson serialization
• Extensible: Easy to create new repositories for custom models by implementing the Model interface
• Backward compatible: Existing code using MongoStorage continues to work

Breaking Changes

None. This is a fully backward-compatible addition:

• MongoStorage is deprecated but still functional
• New code should use MongoStorageManager and typed repositories
• Existing projects can migrate incrementally

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Migration path: Replace MongoStorage with MongoStorageManager.getRepository(YourModel.class, "collection") and ensure your models implement the Model interface.

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