fix: Implement retry logic for YouTube transcript fetching and fix URL decoding issue

[iw4p]

Hi! had problem with youtube part, especially when I wanted to paste url on terminal (MacOS: zsh, bash - Linux: bash).
Also in the README nothing's mentioned about Youtube, I added it until doc completes.

What’s Changed:

This PR introduces several important updates to improve the reliability and functionality of the YouTube transcript fetching process and URL handling:

1. Retry Logic for YouTube Transcript Fetching:

   • I've added a retry mechanism around the YouTube transcript fetching operation. This helps to handle intermittent failures or network issues more gracefully by retrying the operation a few times before failing.

2. Fixed URL Decoding Issue:

   • There was an issue where YouTube URLs with escape characters (like \? and \=) were not being processed correctly, especially when pasted from the terminal. This fix ensures that URLs are properly decoded using urllib.parse.unquote(), so URLs like https://www.youtube.com/watch\?v\=videoID are handled properly.

3. Improved Metadata and Description Extraction:

   • I’ve also improved the logic for extracting metadata and descriptions from YouTube pages. This makes the extraction process more reliable, particularly when dealing with different YouTube page layouts.

4. Error Handling Improvements:

   • Enhanced error handling for the YouTube transcript fetching process, so the system can recover better from failures or missing data.

5. Refactored _findKey Function:

   • The _findKey function has been refactored to simplify its code and make it more efficient by using json.items() for dictionary iteration instead of a more complex recursive method.

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Why This Change is Needed:

• Reliability: The retry mechanism will improve the reliability of fetching transcripts, which can fail due to network issues or API rate limiting.
• Correct URL Processing: With the URL decoding fix, users can now paste URLs directly from the terminal without worrying about escape sequences, ensuring URLs are parsed correctly.
• Better Metadata Handling: The improvements to metadata and description extraction will ensure that we get more accurate data from YouTube pages.
• Resiliency: The improved error handling will help the application deal with temporary issues without failing entirely, making the process more robust.

[iw4p]

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