Help： DIfy should give some progress information while we upload file and start to process it in a rag pipeline

[simonjhy]

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

In the current Dify knowledge base pipeline, there is no visible status information in the UI while documents are being processed. Users cannot see the current progress, how much has been completed, which documents have been processed, or what step the pipeline is currently in.

Additionally, during the processing phase, almost no error information is exposed. Users only become aware of issues when the pipeline eventually fails, at which point the feedback is still very limited.

There should be an extension or hook mechanism that allows developers to customize and expose pipeline status information, or at least a default implementation that provides basic progress indicators and intermediate error reporting.

2. Additional context or comments

No response