修复文件上传BUG

logger bug introduced by https://github.com/imClumsyPanda/langchain-ChatGLM/pull/268 , fixed #295 (#297)

* logging: 统一日志格式输出

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Co-authored-by: Bob Chang <bob.chang@amway.com>
Co-authored-by: imClumsyPanda <littlepanda0716@gmail.com>

* webui优化：解决每次页面刷新后都需要重新选择知识库的问题，增加Flagging收集问答效果。

* Fix: 将gradio版本升级至3.28.3，修复知识库下拉框change事件获取值不是当前选中值的bug。

* solve webui confict

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Co-authored-by: Bob Chang <bob.chang@amway.com>
Co-authored-by: imClumsyPanda <littlepanda0716@gmail.com>