Add weave feedback integration for chat interactions

[thepatrickchin]

Description

• Captures weave call ID for parent trace when workflow is initiated and embeds __TRACE_ID__ in assistant messages
• __TRACE_ID__ is extracted in frontend – when user clicks like/dislike button, API call triggers Weave SDK to set reaction
  for the corresponding trace in Weave.
• Requires addition of feedback endpoint in workflow config that invokes chat_feedback tool

See corresponding PR for frontend implementation NVIDIA/NeMo-Agent-Toolkit-UI#42

Closes #759

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