/claim #2456

This PR implements support for emitting OpenTelemetry-compliant events for prompt and completion logging.

✅ Adds:

• use_legacy_attributes config (default: true)
• emit_prompt_events and emit_completion_events (default: true)
• record_prompt_and_completion() utility function
• Integrated into: completion_wrappers.py, chat_wrappers.py, embeddings_wrappers.py

Fully backward compatible with legacy attributes.

[!IMPORTANT] Add OpenTelemetry-compliant prompt and completion event logging with configurable options and backward compatibility.

• Behavior:
  • Adds OpenTelemetry-compliant event logging for prompt and completion events via record_prompt_and_completion() in utils.py.
  • Configurable via use_legacy_attributes, emit_prompt_events, and emit_completion_events in config.py.
  • Integrated into completion_wrappers.py, chat_wrappers.py, embeddings_wrappers.py.
• Config:
  • Adds use_legacy_attributes, emit_prompt_events, emit_completion_events to Config class in config.py.
• Utility Function:
  • Adds record_prompt_and_completion() in utils.py to emit events or set attributes based on config.

^{This description was created by for 502f1ab2d9e6d9f45d1471812ed3e693fdd1386c. It will automatically update as commits are pushed.}