migrate to yt-dlp from pytube / hacktoberfest

[Pobitro-B]

Title: Migrating to yt-dlp

Shifted YouTube audio provider from pytube to yt-dlp for improved reliability, maintenance, and feature support.

Description: Modified youtube.py and logging.py, changed all uses of pytube to a similar yt-dlp implementation

• Replaced pytube.Search and PyTube usages with yt_dlp.YoutubeDL for search and metadata extraction.
• Updated initialization and search logic to match yt-dlp’s workflow (ytsearch5: query).
• Removed deprecated innertube references.
• Ensured returned Result objects preserve the same fields and data types as before.
• Minor log-level adjustments in logging.py to silence yt-dlp internal messages.

Related Issue: migrate away from pytube #2417

Fixes #2417 — pytube dependency is no longer maintained and currently causes YouTube downloads/search to fail due to repeated HTTP 400 errors.

Motivation and Context

Pytube is outdated and unreliable, breaking frequently due to YouTube-side changes.
yt-dlp offers a stable and feature-rich alternative, ensuring consistent functionality for SpotDL’s YouTube-based downloads and searches.

This migration:

• Restores YouTube search functionality.
• Reduces dependency maintenance.
• Improves resilience against API updates.

How Has This Been Tested?

Environment:

• Windows 11
• Python 3.13
• yt-dlp 2025.08.27
• SpotDL (editable install from main branch)

Tests performed:

• Ran spotdl "Pokemon" and spotdl https://music.youtube.com/watch?v=QyowD-ANifs
• Verified field consistency (title, author, duration, views, url) between pytube and yt-dlp results.

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project
• My change requires a change to the documentation
• I have updated the documentation accordingly
• I have read the CONTRIBUTING document
• I have added tests to cover my changes
• All new and existing tests passed

[Pobitro-B]

Increased the number of results fetched from 5 to 10 for test_youtube.py
Please review and share if any further changes are needed.