fix(PointAnnotationManager): override getDelegate on Android view manager

[mfazekas]

Description

Fixes an Android regression introduced by #4240. The new RNMBXPointAnnotationManagerViewManager never overrode getDelegate(), so under Fabric its props (slot, iconAllowOverlap, textAllowOverlap, …) were never applied and React Native logged a soft exception:

ReactNoCrashSoftException: ViewManager using codegen must override getDelegate method (name: RNMBXPointAnnotationManager).

As a result, PointAnnotationManagers rendered blank on Android — the PointAnnotationManager Multiple example showed no pins. This adds the codegen delegate, matching the other view managers (RNMBXCalloutManager, RNMBXMarkerViewManager). iOS was unaffected (props are applied via updateProps in the component view).

Verified on an emulator (New Architecture): with the fix the soft exception is gone and the top-slot pins render in front of the Standard style's 3D buildings while the bottom-slot pins are occluded behind them, matching iOS.

Checklist

• I've read CONTRIBUTING.md
• I updated the doc/other generated code with running yarn generate in the root folder
• I have tested the new feature on /example app.
  • In New Architecture mode/ios
  • In New Architecture mode/android
• I added/updated a sample - if a new feature was implemented (/example)

Component to reproduce the issue you're fixing

Two managers in different slots — renders blank on Android without this fix

<MapView styleURL="mapbox://styles/mapbox/standard">
  <Camera defaultSettings={{ centerCoordinate: [-74.0115, 40.711], zoomLevel: 15.7, pitch: 62 }} />
  <PointAnnotationManager slot="bottom" iconAllowOverlap>
    <PointAnnotation id="b" coordinate={[-74.0145, 40.7085]}>
      <View style={{ width: 26, height: 26, borderRadius: 13, backgroundColor: 'crimson' }} />
    </PointAnnotation>
  </PointAnnotationManager>
  <PointAnnotationManager slot="top" iconAllowOverlap>
    <PointAnnotation id="t" coordinate={[-74.014, 40.7085]}>
      <View style={{ width: 26, height: 26, borderRadius: 13, backgroundColor: 'royalblue' }} />
    </PointAnnotation>
  </PointAnnotationManager>
</MapView>

Or run Annotations › PointAnnotationManager Multiple in the example app.