Add langchain-yt-dlp Document Loader Documentation (#28775)
## Overview
This PR adds documentation for the `langchain-yt-dlp` package, a YouTube
document loader that uses `yt-dlp` for Youtube videos metadata
extraaction.
## Changes
- Added documentation notebook for YoutubeLoader
- Updated packages.yml to include langchain-yt-dlp
## Motivation
The existing LangChain YoutubeLoader was unable to fetch YouTube
metadata due to changes in YouTube's structure. This package resolves
those issues by leveraging the `yt-dlp` library.
## Features
- Reliable YouTube metadata extraction
## Related
- Package Repository: https://github.com/aqib0770/langchain-yt-dlp
- PyPI Package: https://pypi.org/project/langchain-yt-dlp/
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Co-authored-by: Chester Curme <chester.curme@gmail.com>
