Add entity collection function to enhance the effect of intelligent question and answer

[dajianguo]

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1. Is this request related to a challenge you're experiencing? Tell me about your story.

First of all, I am very grateful to the dify team for providing a good basic platform. We have a customer service scenario requirement. After multiple rounds of verification in the early stage and referring to the other products in the industry, we have made the following design.

Its first version was like this, but it was not smart enough:

Therefore, we referred to Baidu Keyue and redesigned the following, and conducted preliminary effect verification. this is the design:

We plan to complete the above content this month, and hope to get approval and support according to the requirements in CONTRIBUTING.md. As part of integrating open source research and development, we plan to provide relevant designs and codes to the community.

2. Additional context or comments

design.docx

3. Can you help us with this feature?

• [X] I am interested in contributing to this feature.

[crazywoola]

Please add my wechat: crazyphage.

[dajianguo]

Please add my wechat: crazypphage.

The user is not exitsts....