[Navigation] ViewModels created by the Navigator are not disposed

[Nurgo]

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Hi, I'm using Uno Platform with Uno Extensions for ViewModel navigation. I've noticed that when navigating away, the previous ViewModel isn't automatically disposed, potentially leaving resources unmanaged.

If a class implements IDisposable, it it the responsibility of the owner to Dispose instances of the class.

Originally posted by @Nurgo in https://github.com/unoplatform/uno.extensions/discussions/1602

[Nurgo]

I don't understand why this problem is marked as "priority/awaiting-more-evidence", it's a major problem. Each time you navigate to a new ViewModel, the previous one is not disposed, takes memory, and continues to receive events. This makes the application slower and slower, ending in a crash.

[agneszitte]

@nickrandolph maybe @eriklimakc can help take a look at this one ? (as he will be helping with the navigation documentation)