FR: Show use of bindings in sample

[stephlocke]

This issue is for a:

- [ ] bug report -> please search issues before submitting
- [x] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

Expected/desired behavior

It would be really great to demonstrate the use of output bindings in this sample.

[AndreRicardo-Zoetis]

Input bindings would be really useful as well, would like to use this

{
      "name": "starter",
      "type": "durableClient",
      "direction": "in",
      "datatype": "string"
    }

Currently don't even know if it's possible to get these in FastAPI endpoints.

[juanpabloguerra16]

are we ever going to get examples on how to use output bindings on FastAPI Azure Functions? Are they even supported?