feat(VideoManager): add "Continue watching" dialog

[kinhelm]

First draft, feel free to suggest modifications

Changes
Adding a WatchTracker singleton to track watch time and watched episodes. It resets counts on user interaction

Issues
Request of #1327

[nielsvanvelzen]

I think this is a good start but some major changes would need to be made before I'll start reviewing it properly:

• Don't modify translation files via GitHub, that should ALWAYS be done via our Weblate instance at translate.jellyfin.org
• Don't use an object for the "WatchTracker", use dependency injection instead
• Separate UI and logic
  • Preferably using a ViewModel
• Don't use handlers, use proper coroutines instead

[kinhelm]

Hi Niels,
thanks for your review, I'll make those changes :)

[ConnorS1110]

@kinhelm Hi there. I realized that I have been working on implementing a similar feature as what you have here. Is this something you still plan on working on/want to work on? If not, your approach is much better organizationally that what I have so if you didn't want to continue working on it and are ok with me building on what you have, I don't mind trying to take it to the finish line.

[kinhelm]

Hi @ConnorS1110 I was in the process of addressing @nielsvanvelzen comments. I haven't finished yet, but I'm going to push my progress. It's no longer 100% functional, but of course, feel free to build on top of my code to complete this feature, like reset time on user actions :) Since I have a job on the side, I often lack time to make progress on it, but I'm always available to discuss it. :)
I'll rebase and fix conflict and push today

[ConnorS1110]

I managed to get this finished in my PR that is mentioned in the thread of this PR

[nielsvanvelzen]

We already have interaction tracking for our screensaver so I'd rather add a new "InteractionTracker" that will be used by both the screensaver and this feature.

We will not be adding popups during video playback, that's an anti-pattern. Instead, this feature should be implemented in the next-up screen: when a video item ends and we want to know if a user is still watching it will show a different screen that will behave similarly to the popup you currently have.

All new UI must be written in Compose.