feat: add rag eval pipeline for ops

[inardini]

This notebook shows how you can use Vertex AI Pipelines to build a GenAI Model Evaluation Batch pipeline to evaluate a question-answering task with Rapid Eval API and DataflowML.

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[conventional-commit-lint-gcf[bot]]

🤖 I detect that the PR title and the commit message differ and there's only one commit. To use the PR title for the commit history, you can use Github's automerge feature with squashing, or use automerge label. Good luck human!

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[holtskinner]

Closing due to inactivity. Please re-open once comments are addressed.