feat(sample): add a pipeline example about rag

[sefgsefg]

File locate: /samples/contrib/RAG_kubeflow
Description: I add an example about running RAG with LLM in kubeflow pipeline. Users can upload their data and choose LLM model from huggingface, and they can input the question to test the model. The model will answer from the data that user upload.

btw, I had try to use action to run this example, but this code involve some account infomation (like huggingface). Users can follow the README.md to create the database and input some options, like what model users want to use.

[google-oss-prow]

Hi @sefgsefg. Thanks for your PR.

I'm waiting for a kubeflow member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[rimolive]

/rerun-all

[rimolive]

@sefgsefg There's something wrong in your PR. You are changing +300 files and adding +50 commits. Verify if your branch needs rebase.

/hold

[google-oss-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
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[sefgsefg]

@rimolive Uh sorry, I didn't notice that I add origin update into commit.

[rimolive]

/rerun-all