LLM Call Tracing: Standardize format and metadata #1048

Is your feature request related to a problem?
The current llm call tracing is not structured properly compared to evaluation tracing. This makes it difficult to view essential information, affecting usability.

Describe the solution you'd like

• Standardize the llm call tracing format.
• Include metadata for type, format, and language code.
• Ensure easy viewing of the structured tracing data.