* Fixes to setting StreamingChunk.index properly and refactoring tests for conversion
* Make _convert_chat_completion_chunk_to_streaming_chunk a member of OpenAIChatGenerator so we can overwrite it in integrations that inherit from it
* Fixes
* Modify streaming chunk to accept a list of tool call deltas.
* Fix tests
* Fix mypy and update original reno
* Undo change
* Update conversion to return a single streaming chunk
* update to print streaming chunk
* Fix types
* PR comments
* Start expanding StreamingChunk
* First pass at expanding Streaming Chunk
* Working version!
* Some tweaks and also make ToolInvoker stream a chunk with a finish reason
* Properly update test
* Change to tool_name, remove kw_only since its python 3.10 only and update HuggingFaceAPIChatGenerator to start following new StreamingChunk
* Add reno
* Some cleanup
* Fix unit tests
* Fix mypy and integration test
* Fix pylint
* Start refactoring huggingface local api
* Refactor openai generator and chat generator to reuse util methods
* Did some reorg
* Reusue utility method in HuggingFaceAPI
* Get rid of unneeded default values in tests
* Update conversion of streaming chunks to chat message to not rely on openai dataclass anymore
* Fix tests and loosen check in StreamingChunk post_init
* Fixes
* Fix license header
* Add start and index to HFAPIGenerator
* Fix mypy
* Clean up
* Update haystack/components/generators/utils.py
Co-authored-by: Julian Risch <julian.risch@deepset.ai>
* Update haystack/components/generators/utils.py
Co-authored-by: Julian Risch <julian.risch@deepset.ai>
* Change StreamingChunk.start to only a bool
* PR comments
* Fix unit test
* PR comment
* Fix test
---------
Co-authored-by: Julian Risch <julian.risch@deepset.ai>
* Refactor HFAPI Chat Generator
* Add component info to generators
* Fix type hint
* Add reno
* Fix unit tests
* Remove incorrect dev comment
* Move _convert_streaming_chunks_to_chat_message to utils file
