feat: Add extra field in ToolCall and ToolCallDelta

[Amnah199]

Related Issues

• fixes Currently we are not able to store provider specific keys in tool calls.

Proposed Changes:

Add an extra dict in ToolCall and ToolCallDelta

How did you test it?

Update the tests

Notes for the reviewer

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test: and added ! in case the PR includes breaking changes.
• I documented my code
• I ran pre-commit hooks and fixed any issue

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1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
haystack-docs	Ignored	Preview		Nov 5, 2025 0:04am

[coveralls]

Pull Request Test Coverage Report for Build 19101366474

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 5 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.001%) to 92.253%

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Files with Coverage Reduction	New Missed Lines	%
dataclasses/chat_message.py	2	99.33%
dataclasses/streaming_chunk.py	3	95.77%

Totals
Change from base Build 19099376897:	0.001%
Covered Lines:	13515
Relevant Lines:	14650

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💛 - Coveralls

[sjrl]

Looks good!