Add support for custom Q&A in the knowledge base

[dajianguo]

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

I need to import some Q&A text，I don't need LLM to generate results for me。
Same question #4664 #6904 #7735 #7430
I modified the code to support excel and csv uploading qa files。
The processing logic is that when there are only two columns in csv or excel and qa mode is selected, the LLM will not be called。

2. Additional context or comments

No response

3. Can you help us with this feature?

• I am interested in contributing to this feature.

[dosubot]

Hi, @dajianguo. I'm Dosu, and I'm helping the Dify team manage their backlog. I'm marking this issue as stale.

Issue Summary:

• Proposal to add support for custom Q&A in the knowledge base.
• Feature to import Q&A text directly from Excel and CSV files without a language model.
• You have already made code modifications for this feature.
• No additional comments or activities on the issue.

Next Steps:

• Please let us know if this issue is still relevant to the latest version of the Dify repository by commenting here.
• If there is no further activity, this issue will be automatically closed in 15 days.

Thank you for your understanding and contribution!