[Request] Add support for other text-embedding model providers

[spuniun]

🥰 Feature Description

Because chunking of file uploads depends on text-embedding to be functional, the entire knowledge base feature does not work without API keys from OpenAI itself. Since other providers such as Github and Azure provide these models as well, it would be nice to support alternate API endpoints for this feature.

🧐 Proposed Solution

Add environment variables that allow for the customization of file chucking providers

📝 Additional Information

https://github.com/marketplace/models/azure-openai/text-embedding-3-large
https://github.com/marketplace/models/azure-openai/text-embedding-3-small
https://learn.microsoft.com/en-us/azure/ai-services/openai/concepts/models#embeddings-models

This request is a dupe of #4128 but that request was closed after being marked as a duplicate of itself.

[lobehubbot]

👀 @spuniun

Thank you for raising an issue. We will investigate into the matter and get back to you as soon as possible.
Please make sure you have given us as much context as possible.
非常感谢您提交 issue。我们会尽快调查此事，并尽快回复您。 请确保您已经提供了尽可能多的背景信息。

[arvinxx]

duplicate with #3785

[lobehubbot]

✅ @spuniun

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