Evals: Decouple from Langfuse

[PritamSGB]

Is your feature request related to a problem?
We need to enhance Evals on Glific for better flexibility and independence from langfuse. This current dependency limits our ability to assess and improve Eval efficiency.

Describe the solution you'd like

• Implement Evals on Glific
• Decouple Evals from langfuse
  • v0: Static LLM judge prompt for correctness
  • v1: Ability to change the prompt (versioning)

Original issue

• Evals on Glific
• Decouple Evals from langfuse
  v0 - static llm judge prompt for correctness
  v1 - ability to change the prompt (versioning)