* Create requirements-docker.txt

* feat: update deps to support rag

* feat: add support to rag, add rag_data_reader api for rag integration

* feat: let user retrieve the filename of the processed file

* feat: add projects demo for rag integrations

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Co-authored-by: Xiaomeng Zhao <moe@myhloli.com>
Co-authored-by: icecraft <xurui1@pjlab.org.cn>