Add out-of-process hang tracking with Native backend on Windows, Linux, and Mac

[tustanivsky]

This PR adds support for sentry-native's out-of-process app-hang detection and wires it into the plugin's existing hang-tracking configuration, so that the Native backend gets daemon-side hang reporting instead of the engine-side watcher.

• Example hang event captured on Windows
• Example hang event captured on Linux
• Example hang event captured on Mac (Editor, no symbolicated stacktrace)

Key changes

• When the native backend is selected (UseNativeBackend) on a supported platform, EnableHangTracking now drives sentry-native's app-hang detector instead of the engine FThreadHeartBeat watcher:
  • sentry_options_set_app_hang_enabled and sentry_options_set_app_hang_timeout_ms are configured before sentry_init (using the existing HangTimeoutDuration value as the timeout).
  • A lightweight per-frame heartbeat is registered on FCoreDelegates::OnEndFrame. Because OnEndFrame is broadcast on the game thread, the first tick latches it as the monitored thread (sentry_app_hang_set_target_thread), and each subsequent frame refreshes the heartbeat (sentry_app_hang_heartbeat). The out-of-process crash daemon monitors heartbeat staleness and emits an ApplicationNotResponding event while the game continues running.
• The engine watcher (FSentryHangWatcher) is automatically disabled when the native detector is active to avoid double-reporting. It remains the fallback path for the Crashpad backend and on platforms where native app-hang detection is not supported.

Known limitations

• Supported on desktop platforms with the native backend.
• On macOS, hang tracking doesn't work in sandboxed game builds.

Relate items

• feat(native): Added App Hang capture for Windows sentry-native#1781
• feat(native): Added App Hang capture for Linux sentry-native#1801
• feat(native): Added App Hang capture for macOS sentry-native#1780
• Add app hang tracking for Windows and Linux #1270
• feat: in proc App Hang capture sentry-native#1806

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