Support MiniMax abab-6.5 family

[ifsheldon]

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1. Is this request related to a challenge you're experiencing?

I'd like to access MiniMax newly released Abab-6.5 models.

2. Describe the feature you'd like to see

Support Abab-6.5 and Abab-6.5s

3. How will this feature improve your workflow or experience?

We can use these new models which are claimed to have much better performance

4. Additional context or comments

The APIs remain the same, so I think we can just add two new entries for these models.

5. Can you help us with this feature?

• [ ] I am interested in contributing to this feature.