[Enhancement]: Add option to configure fallback model for agent

What features would you like to see added?

Option to configure fallback model that will handle request in case primary model will return error (e.g. 429 too many requests etc.). Ability to set fallback model for agents will be highly appreciated.

More details

N/A

Which components are impacted by your request?

No response

Pictures

N/A

Code of Conduct

• I agree to follow this project's Code of Conduct