feat: support tidb vector

[Weaxs]

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

nope

2. Describe the feature you'd like to see

I want to add vdb type —— support tidb vector.
https://pypi.org/project/tidb-vector/
https://github.com/pingcap/tidb-vector-python

tidb vector was already supportted in Langchain and Llama index. Reference

• langchain/blob/master/libs/community/langchain_community/vectorstores/tidb_vector
• llama-index-integrations/vector_stores/llama-index-vector-stores-tidbvector

add Vector Store Configurations:

• TIDB_VECTOR_HOST
• TIDB_VECTOR_PORT
• TIDB_VECTOR_USER
• TIDB_VECTOR_PASSWORD
• TIDB_VECTOR_DATABASE

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

I can use tidb serverless cloud for vector store

4. Additional context or comments

Sync dify-docs

5. Can you help us with this feature?

• I am interested in contributing to this feature.