Leverage Symfony's MakerBundle to generate boilerplate code.

[b00gizm]

In order to make it easier for users to adopt DDD, it would be great to provide custom Makers to generate boilerplate code and organize code in a more DDD-preferred/conform way.

Some ideas:

MakeModel

• Lives in src/Domain/Model
• Can inherit from AggregateRoot
• Can have a dedicated identity value object (e.g. Order → OrderId / OrderUuid)
• If also used as Doctrine entity, choice between annotations and separate config in src/Infrastructure/Doctrine/ORM/config
  • If used with annotations, the Doctrine config must be updated to accommodate for the custom path

MakeRepsitory

• Lives (as interface) in src/Domain/Repository
• Extends the Repository contract from geekcell/php-ddd
• Can have a Doctrine implementation, which lives in src/Infrastructure/Doctrine/ORM/Repository
  • Inherits from GeekCell\DddBundle\Infrastructure\Doctrine\Repository
  • Parent constructor needs to know about the managed entity

MakeCommand / MakeQuery

• Lives in src/Application/{Command,Query}
• Implements the Command / Query contract from geekcell/ddd
• Has a corresponding command/query handler
  • Same name as command/query with Handler suffix
  • Implements the CommandHandler / QueryHandler contract from geekcell/ddd
  • Has a #[AsMessageHandler] annotation
  • Has a __invoke method with the corresponding command/query as argument

MakeResource

• API Platform resource (> 2.7)
• Lives in src/Infrasturcture/ApiPlatform/Resource
• Has a corresponding model (e.g. Order → OrderResource)
• The resource has a convenience method public static fromModel(...)
  • Choice between annotations or separate config
  • config/packages/api_platform.yaml needs to be updated with the custom resource path
  • Can have one or more data provider (read operations) which live in src/Infrasturcture/ApiPlatform/State
    • Has a query bus
  • Can have one or more data processors (write operations) which live in src/Infrasturcture/ApiPlatform/State
    • Has a command bus

MakeController

• Lives in src/Infrastructure/Http/Controller
• Can have a command bus, a query bus, or both
• Other than that → standard Symfony configuration

### Makers to implement
- [x] Add Maker for domain models (`MakeModel`) https://github.com/geekcell/ddd-symfony-bundle/pull/14
- [x] Add Maker for repositories (`MakeRepository`) https://github.com/geekcell/ddd-symfony-bundle/pull/14
- [x] Add Maker for commands and queries (`MakeCommand`, `MakeQuery`) https://github.com/geekcell/ddd-symfony-bundle/pull/21
- [x] Add Maker for API Platform resources (`MakeResource`) https://github.com/geekcell/ddd-symfony-bundle/pull/25
- [x] Add Maker for controllers `MakeController`) https://github.com/geekcell/ddd-symfony-bundle/pull/22