[Frontend] support new lora module to a live server in OpenAI Entrypoints

[AlphaINF]

Previous version of OpenAI entrypoints didn't support adding lora adapter to a live server.
Now you can use my version to add an adapter path by some command:

curl -X GET your_host:your_port/add_lora \
    -H "Content-Type: application/json" \
    -d '{
        "lora_name": "your_new_lora_model_name",
        "lora_local_path": "your_new_lora_model_path"
    }'

After adding the model, you can use these model like another exist loras.

[simon-mo]

We will review #3308 as it also have a delete API for completeness.

[TangJiakai]

Could you please tell me when the online service feature for adding LoRA weights will be officially integrated?

[Jeffwan]

We had a different version with more test and better coverage (chat/completion/embedding). Let me rebase to master and share with the community. @TangJiakai @simon-mo

[github-actions]

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[mergify]

This pull request has merge conflicts that must be resolved before it can be
merged. @AlphaINF please rebase it. https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/syncing-a-fork