Add dashvector self query retriever (#9684)
## Description
Add `Dashvector` retriever and self-query retriever
## How to use
```python
from langchain.vectorstores.dashvector import DashVector
vectorstore = DashVector.from_documents(docs, embeddings)
retriever = SelfQueryRetriever.from_llm(
llm, vectorstore, document_content_description, metadata_field_info, verbose=True
)
```
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Co-authored-by: smallrain.xuxy <smallrain.xuxy@alibaba-inc.com>
Co-authored-by: Harrison Chase <hw.chase.17@gmail.com>
