FastAPI CloudEvents

Handles both binary and structured CloudEvents formats seamlessly, eliminating manual `to_structured` or `from_http` calls, as shown in the simple example with curl commands.

Uses familiar FastAPI patterns with type hints and Pydantic models, making it intuitive for developers already in the FastAPI ecosystem, similar to defining regular request models.

Supports binary or structured response modes via configurable settings and response classes, demonstrated in the structured response example with `StructuredCloudEventResponse`.

Enables discrimination and routing based on CloudEvent type using Pydantic models and Python's type system, as illustrated in the type routing example with `Annotated` and `Union`.