Implement CRUD Operations for Pizzas

[Grabtot]

Develop the endpoints for creating, reading, updating, and deleting pizzas. Ensure that the operations handle the associated ingredients correctly.

• POST /pizzas: Create a new pizza.
• GET /pizzas: Retrieve a list of all pizzas.
• GET /pizzas/{id}: Retrieve a specific pizza by id.
• PUT /pizzas/{id}: Update a specific pizza by id.
• DELETE /pizzas/{id}: Delete a specific pizza by id.