Custom Video Playlist / Continuous Queue Support

[OEM200]

Issue Details

Is your feature request related to a problem? Please describe.
Yes, currently the AdGuard player on iOS allows playing only one video at a time. Once the video ends, the playback stops, and the user must manually navigate to select and play the next video. This disrupts the viewing experience, especially when watching a series of videos or listening to music.

Describe the solution you'd like
I propose adding a "Custom Playlist" or "Add to Queue" feature within the player.
The functionality should allow users to:

1. Create a list of videos (manually selected or via pasted links).
2. Enable continuous playback, where the app automatically plays the next video in the queue without user intervention.
3. Manage the queue (reorder or remove videos).

Describe alternatives you've considered
The only current alternative is manually opening links one by one, which is tedious and prevents a "hands-free" or continuous background listening experience.

Additional context
This feature would significantly enhance the app's utility as a privacy-focused media player, similar to how "Watch Later" playlists work on streaming platforms, but within the AdGuard environment.