feat: include gen_ai.conversation.id in OTEL spans (#421)

[JEETDESAI25]

Ref #421

This change adds the gen_ai.conversation.id attribute to OTEL spans, allowing messages within the same conversation to be linked in AI evaluation and observability platforms.

Changes

• Added genAiConversationID constant
• Stored sessionID in variable to avoid duplicate method calls
• Added gen_ai.conversation.id attribute to TraceLLMCall

Testing Plan

• All existing tests pass (go test ./...)
• Verified with go build and golangci-lint run
• New attribute appears in OTEL spans alongside gcp.vertex.agent.session_id

Reference

• OTEL GenAI Semantic Conventions: https://opentelemetry.io/docs/specs/semconv/gen-ai/gen-ai-spans/

[gemini-code-assist[bot]]

Summary of Changes

Hello @JEETDESAI25, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the observability of AI conversations by adding a new gen_ai.conversation.id attribute to OpenTelemetry spans. This change allows for a clearer understanding of conversational flows in AI evaluation platforms by explicitly linking related messages, thereby improving the ability to trace and analyze user interactions.

Highlights

• New OTEL Span Attribute: Introduced the gen_ai.conversation.id attribute to OpenTelemetry spans, enabling better linking of messages within the same conversation for AI evaluation and observability.
• Code Optimization: Refactored the TraceLLMCall function to store the sessionID in a local variable, avoiding duplicate method calls and addressing previous feedback.

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