Add game-thread ANR detection on Android

[tustanivsky]

This PR routes sentry-java's heartbeat ANR watchdog at Unreal's game thread so its hangs are detected and reported with a native stacktrace.

Related items:

• poc: android anr sentry-unity#2681
• poc: hearbeat anr sentry-java#5431
• poc: thread sampling sentry-native#1721

[github-actions]

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Please add an entry to CHANGELOG.md to the "Unreleased" section. Make sure the entry includes this PR's number.

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## Unreleased

### Features

- Add game-thread ANR detection on Android ([#1417](https://github.com/getsentry/sentry-unreal/pull/1417))

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Generated by 🚫 dangerJS against 7888a19

[tustanivsky]

Closing this for now as the current plan is to use sentry-native's native backend for hang tracking on Android. This PR can serve as a fallback option if that approach turns out not to be feasible.