Added YouTube Transcript RAG pipeline using Haystack.

[Sanjjjayyy]

Description

Added a new cookbook notebook that builds a RAG pipeline over any
YouTube video transcript using Haystack and HuggingFace free Inference API.

What this cookbook covers

• Fetching YouTube transcripts using youtube-transcript-api
• Splitting and indexing using DocumentSplitter and InMemoryDocumentStore
• Embedding using SentenceTransformers with BAAI/bge-base-en-v1.5
• Retrieval using InMemoryEmbeddingRetriever
• Answer generation using Qwen2.5-7B-Instruct via HuggingFace Inference API

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[kacperlukawski]

I think it would be more Haystack-way to create a custom component that fetches YT transcripts, so then we can build a pipeline.

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[kacperlukawski]

It would be better to build a pipeline out of these manual wirings.

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[kacperlukawski]

That would be also easier to follow for Haystack users, if we just created a pipeline.

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[Sanjjjayyy]

Hi @kacperlukawski, thanks for the detailed feedback!

I understand the changes needed:

1. Wrap the transcript fetching in a custom Haystack component
2. Rebuild the pipelines using the proper Haystack Pipeline way

I'll work on these changes and update the PR shortly.

[kacperlukawski]

@Sanjjjayyy Exactly, I think these changes would align better with the best practices of using Haystack