Fix: Preserve index field in tool call responses

[ashinzekene]

Description

Fixed an issue where tool call responses had index=None instead of preserving the index from the incoming message, which was inconsistent with other partial responses.

Changes Made

• Fixed _stream_request_with_tools to preserve the index field when yielding tool call responses
• Updated tool call response to pass through index field from incoming message (matching behavior of other partial responses)
• Added test case to verify index preservation in tool call responses
• Bumped version to 0.0.82

Testing Done

• Verified fix works correctly with manual test
• Existing tool call tests continue to pass
• Added new test case test_stream_request_with_tools_index_preserved to verify index preservation

Version

• Updated to version 0.0.82

Breaking Changes

• None

Checklist

• Tests added
• Documentation updated (not needed for this bug fix)
• Version bumped
• Changes tested locally