feat(model): Support tongyi embedding

[zhenchaozhu]

Description

Support tongyi embedding

How Has This Been Tested?

Test passed

Snapshots:

Include snapshots for easier review.

Checklist:

• [✔] My code follows the style guidelines of this project
• [✔] I have already rebased the commits and make the commit message conform to the project standard.
• [✔] I have performed a self-review of my own code
• [✔] I have commented my code, particularly in hard-to-understand areas
• [] I have made corresponding changes to the documentation
• [✔] Any dependent changes have been merged and published in downstream modules

[csunny]

Thanks for your PR， great feature.

[csunny]

File /DB-GPT/dbgpt/rag/embedding/embeddings.py", line 891, in embed_documents
        |     embeddings = resp["output"]["embeddings"]
        | TypeError: 'NoneType' object is not subscriptable

How to set the .env config to test this? Please update .env.template for tongyi_proxy

[Aries-ckt]

EMBEDDING_MODEL=proxy_tongyi
proxy_tongyi_proxy_backend=text-embedding-v1
proxy_tongyi_proxy_api_key={your-api-key}

[chuangzhidan]

EMBEDDING_MODEL=proxy_tongyi
proxy_tongyi_proxy_backend=text-embedding-v1
proxy_tongyi_proxy_api_key={your-api-key}

how to use this ,set those in .env?