[DuckPlayer] - Base Implementation

[afterxleep]

Task/Issue URL: https://app.asana.com/0/1204099484721401/1207593922684284/f
Tech Design URL: https://app.asana.com/0/1204099484721401/1207530480716552/f

Description:

• Implements base DuckPlayer functionality based on macOS code
• Abstract navigation logic and Adds a YoutubeNavigationHandler to TabViewController that is used when DuckPlayer is enabled
• Adds App Settings to Manage DuckPlayer State
• Adds Tests for the Navigation Handler to ensure redirect works as expected and completion calls are always called

Steps to test this PR:

1. Make yourself internal User
2. Go to Settings > DuckPlayer and Select 'Always'
3. Navigate to youtube.com and tap on a video
4. Confirm video loads in DuckPlayer
5. Go Back
6. Confirm you're taken back to the Main YouTube page
7. Enter a Duck URL in the Omnibar, like. duck://player/0HZPyhnErFo
8. Confirm video is loaded in DuckPlayer
9. Go back to settings and disable DuckPlayer
10. Confirm YouTube video links no longer load in Duck player

⚠️ Known issues / Work in progress

This is the first of several PRs and is still missing features

• AlwaysASK mode does not work
• Youtube Video overlays do not work
• DuckPlayer UI uses macOS HTML views (mobile views are WIP)
• DuckPlayer UI buttons do not work
• Settings Design is not fully implemented

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Internal references:

Software Engineering Expectations
Technical Design Template

[github-actions]

	Warnings
⚠️	PR has more than 500 lines of code changing. Consider splitting into smaller PRs if possible.

Generated by 🚫 dangerJS against 12f9f01

[Bunn]

LGTM, added some comments but nothing looks critical