FastChat as a backend service to support more models

[bluechanel]

Description

OpenAI-like interface based on FastChat to provide more model calling support

Motivation and Context

More models are supported, such as Qwen, by looking at the https://github.com/lm-sys/FastChat/blob/main/docs/model_support.md

Types of changes

What types of changes does your code introduce? Put an x in all the boxes that apply:

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds core functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] Documentation (update in the documentation)
• [x] Example (update in the folder of example)

Checklist

Go over all the following points, and put an x in all the boxes that apply. If you are unsure about any of these, don't hesitate to ask. We are here to help!

• [x] I have read the CONTRIBUTION guide. (required)
• [x] My change requires a change to the documentation.
• [x] I have updated the tests accordingly. (required for a bug fix or a new feature)
• [x] I have updated the documentation accordingly.

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[Wendong-Fan]

Hey @fbaldassarri , thanks for this PR! Since I notice it didn't pass all the CI tests, is this PR still under development? If so I will switch this PR into draft

[bluechanel]

Hey @fbaldassarri , thanks for this PR! Since I notice it didn't pass all the CI tests, is this PR still under development? If so I will switch this PR into draft

thank you for your attention. I fixed an type annotations. Some tests failed due to lack of environment variables. I don't have google key, openai key, etc. can you help me

[ocss884]

Hi @bluechanel , thx for PR. Since the current open-source solution is entirely based on fastchat. How about also refactor the opensource model?

[bluechanel]

Hi @bluechanel , thx for PR. Since the current open-source solution is entirely based on fastchat. How about also refactor the opensource model?

I've modified the relevant code to add FastChat as a model backend, but I haven't refactored the OpenSource-related code.

I believe there's an ambiguity between ModelPlatformType.OPENSOURCE and ModelPlatformType.FASTCHAT. Perhaps the OPENSOURCE-related code should be removed. If you agree, I will remove the OPENSOURCE-related code and resubmit.