Added response validation

check examples/response_validation.py

""" A decorator for serializing response dictionaries or SQLAlchemy objects. Supports both Pydantic and Marshmallow.

    Usage::
        from typing import Optional

        from pydantic import BaseModel
        from sqlalchemy import Column, Integer, String
        import responder

        from .models import Item

        class Item(Base):
            __tablename__ = "items"
            id = Column(Integer, primary_key=True)
            name = Column(String)

        class ItemCreate(BaseModel)
            id: Optional[int]
            name: str

            class Config:
                from_attributes = True

        api = responder.API()

        @api.route("/all")
        @api.ensure(ItemCreate)
        async def all_items(req, resp):
            "Get all items"

        return session.query(Item)

        @api.route("/create")
        @api.trust(ItemCreate)
        @api.ensure(ItemCreate)
        async def create(req, resp, *, data):
            "Create item"

            item = Item(**data)
            session.add(item)
            session.commit()

            return item
    """

Summary by CodeRabbit

New Features
- Introduced a web service for creating and retrieving books with data validation.
- Added new API endpoints for book management.
- Implemented data serialization for API responses using Pydantic and Marshmallow.
Enhancements
- Added functionality to mount WSGI/ASGI applications within the service.
Dependencies
- Included SQLAlchemy in the project dependencies for database interactions.

Walkthrough

The update introduces a Python web service with Responder, integrating SQLAlchemy for database operations and Pydantic/Marshmallow for data validation. New API endpoints for book management are added, and the Responder module is enhanced with serialization and application mounting capabilities.

Changes

File Path	Change Summary
`examples/response_validation.py`	Added a web service with endpoints for creating and retrieving books, using SQLAlchemy and data validation with Pydantic/Marshmallow.
`responder/api.py`	Added `ensure` and `mount` methods for response serialization and application mounting, respectively.
`setup.py`	Included "sqlalchemy" in the dependencies list.

🐇 In the code's gentle weave, 🍂
A tale of books and schemas conceived.
As autumn leaves in crisp air twirl,
Our service dances, a new world unfurled. 🌐✨

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kennethreitz / responder