Setup model routing config and plan routing to o1

[ryanhoangt]

End-user friendly description of the problem this fixes or functionality that this introduces

• [ ] Include this change in the Release Notes. If checked, you must provide an end-user friendly description for your change below

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Give a summary of what the PR does, explaining any non-trivial design decisions

This PR is to:

• Setup config for model routing-related features.
• Implement a prototype for routing to reasoning models if appropriate. The criteria are based on this paper.

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Link of any specific issues this addresses