### What problem does this PR solve?

Add Langfuse APIs

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

Langfuse update model has no fields attribute

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

### What problem does this PR solve?

#6155

Add basic Langfuse support for LLM module.

A trace example:

<img width="755" alt="image"
src="https://github.com/user-attachments/assets/25c1f852-5116-486c-a47f-6097187142ca"
/>


### Type of change

- [x] New Feature (non-breaking change which adds functionality)