Feature: Different models for different roles

[vanyauhalin]

Is your feature request related to a problem? Please describe.

Each model handles the task differently. Using different models to solve different problems using roles sounds logical.

Describe the solution you'd like

roles:
  grammar:
    model: gpt-4o
    promt: []

Clear, intuitive, but brakes compatibility.

Describe alternatives you've considered

roles:
  grammar: []
  grammar-model: gpt-4o

Wierd, non-intuitive, but keeps compatibility.

Additional context

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