feat: Add decorators to automatically map the methods and pytrickle cli to create working examples.

[JJassonn69]

This PR brings much needed QoL to the developer experience when building with pytrickle by having a default pass-through and quick demo application using pytrickle cli.

---

Developer experience improvements

• Clear, consistent returns: tensors/ndarrays now “just work” and preserve timing/metadata.
• Both sync and async user code are supported without blocking the event loop.
• Scaffolding includes concrete examples so developers can modify a working baseline instead of guessing the contract.
• Param updates optionally validated with Pydantic v1/v2 without forcing a hard dependency.

[ad-astra-video]

@JJassonn69 can you add a decorator for the send_frame functionality for generative streams?

[JJassonn69]

@JJassonn69 can you add a decorator for the send_frame functionality for generative streams?

Yeah i could but unless pytrickle adds send_frame in the internal_frameprocessor it wont actually work.