Switch to callback-registration style for Activity Results

[imhoffd]

We can investigate if it's possible to use the new callback-registration and allow Android to manage request codes for the Capacitor ecosystem.

To allow the system to manage the request code that's associated with a permissions request, add a dependency on the androidx.activity library in your module's build.gradle file. Use version 1.2.0 or later of the library.

• https://developer.android.com/training/permissions/requesting#allow-system-manage-request-code
• https://developer.android.com/training/basics/intents/result#register

[imhoffd]

resolved by #4033

[ionitron-bot]

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