* Starting property schema refactor
* Adding more tests
* More tests
* Handle null type explicitly
* More updates of tests to accomodate Optional properly
* Fix more tests
* Remove unecessary check
* Some cleanup
* Update test
* Add reno
* Fix typing
* Add license header
* Use docstrings of dataclasses in parameter spec generation
* More tests of Haystack dataclass types
* Properly handle Sequence
* Fix license header
* Update OpenAI tests to add more complicated tool parameter signature
* Properly set required for dataclasses
* Add integration test for azure that includes additionalProperties
* Add more complicated integration test for HuggingFaceAPIChatGenerator
* Alternate approach using pydantic like we do in from_function.py
* Cleanup and fix other affected tests
* Fix mypy
* PR comments
* PR comment
* Remove test from HF API
* Update reno
* Update reno
