feat: WatsonXChatGenerator - support Tools and use the StreamingChunk fields (#2902)

* feat: Update WatsonXChatGenerator to use the StreamingChunk fields

* fix: Formatting issue

* feat(watsonx): Add support for tool calling

* fix: Fix dict key error bugs and update existing tests

* Increase minimum version required

* test: Add tests for tool calling and improve robustness of tool calling

* test: Add test with real chunks and add more chunk metadata

* Use public method for converting to openai dict format

* Fix tool call parsing errors

* Fix type error

Author: maxdswain

integrations/watsonx/pyproject.toml

@@ -22,7 +22,7 @@ classifiers = [
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
 ]
-dependencies = ["haystack-ai>=2.17.1", "ibm-watsonx-ai>=1.3.26", "pandas>=2.2.3"]
+dependencies = ["haystack-ai>=2.24.1", "ibm-watsonx-ai>=1.3.26", "pandas>=2.2.3"]
 
 [project.urls]
 Documentation = "https://github.com/deepset-ai/haystack-core-integrations/tree/main/integrations/watsonx#readme"