chore: register geofence module with native SDKs

[mrehan27]

Summary

Wires the geofence module into the native SDK builders during initialize() on Android and iOS. Geofence runs automatically once registered (no Flutter-facing methods) and depends on the Location module, which is registered — with the app's config if provided, otherwise defaults (manual) — whenever geofence is enabled.

• Android — new CustomerIOGeofence bridge registers ModuleGeofence; the reference is isolated in its own class so a disabled/compileOnly dependency can't trigger NoClassDefFoundError. initialize() registers Location when either location or geofence is configured.
• iOS — initialize() adds GeofenceModule() plus LocationModule under the canImport guards.

Ticket

MBL-1783 — Flutter: add geofencing support

PR stack

1. Build enablement + config → feature/geofence-on-device (chore: add geofence module build enablement and config #354)
2. (this PR) Register geofence module with native SDKs → stacks on chore: add geofence module build enablement and config #354
3. Enable geofence in sample apps → coming next

⚠️ Stacked on #354 — review/merge that first; this PR targets its branch.

Testing

flutter analyze + unit tests pass. Validated by building both sample apps against local geofence natives: Android APK links the geofence artifact; iOS Runner.app links CioLocationGeofence.framework.

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Note

Medium Risk
Changes SDK initialization and location/geofence registration, which affects background location behavior when geofence is enabled; mitigated by compile-time flags and isolated bridge classes on Android.

Overview
Geofencing is wired into native SDK setup on Android and iOS so it starts automatically when the Flutter app passes a geofence block in initialize() (no new Dart method channel API).

On Android, an optional CustomerIOGeofence bridge is added to the plugin module list when CIO_GEOFENCE_ENABLED is on; initialize() registers ModuleGeofence via that bridge. Location is now configured when either location or geofence is present (geofence-only apps still get location with defaults), still guarded by CIO_LOCATION_ENABLED so optional native artifacts are not referenced when disabled.

On iOS, initialize() registers GeofenceModule() when geofence is in the init params (canImport(CioLocationGeofence)), and registers LocationModule when location or geofence is configured, using location tracking mode from location or defaulting to manual.

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[github-actions]

Sample app builds 📱

Below you will find the list of the latest versions of the sample apps. It's recommended to always download the latest builds of the sample apps to accurately test the pull request.

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