Support metadata write like source for knowledge base

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

I'm using dify knowledge base, all of the document is imported from ouside tools like github wiki, dify has reference in the dialog, but what I prefer is a link to the source, which can make the document more accessable, people can edit the document directly if there's anything wrong.

2. Describe the feature you'd like to see

When importing documents, users should be able to provide additional fields like source, link, and when providing info using particular documents , if the source, link exists, return users with these info, so they can view the original document or edit them.

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

already described above.

4. Additional context or comments

No response

5. Can you help us with this feature?

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

[dosubot[bot]]

It seems like you've got this under control, if you want help or have specific questions, let me know what I can do for you!

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[JohnJyong]

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