fix: Add retriever self_query and score_threshold in DingoDB

[HeChangHaoGary]

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langchain	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 4, 2024 2:46am

[HeChangHaoGary]

@baskaryan Can you help me review it?

[baskaryan]

coudl we add some unit tests?

[HeChangHaoGary]

Of course, I added some unit tests