[iOS] Added showsUserLocation property support for Google Maps (react-native-maps#721)

* Added suppport for the property showsUserLocation on iOS for GoogleMaps

* CS fix

Author: Julien Rodrigues

ios/AirGoogleMaps/AIRGoogleMap.h

@@ -32,6 +32,7 @@
 @property (nonatomic, assign) BOOL zoomEnabled;
 @property (nonatomic, assign) BOOL rotateEnabled;
 @property (nonatomic, assign) BOOL pitchEnabled;
+@property (nonatomic, assign) BOOL showsUserLocation;
 
 - (BOOL)didTapMarker:(GMSMarker *)marker;
 - (void)didTapAtCoordinate:(CLLocationCoordinate2D)coordinate;

ios/AirGoogleMaps/AIRGoogleMap.m

@@ -236,4 +236,12 @@ - (void)setShowsCompass:(BOOL)showsCompass {
 - (BOOL)showsCompass {
   return self.settings.compassButton;
 }
+
+- (void)setShowsUserLocation:(BOOL)showsUserLocation {
+  self.myLocationEnabled = showsUserLocation;
+}
+
+- (BOOL)showsUserLocation {
+  return self.myLocationEnabled;
+}
 @end

ios/AirGoogleMaps/AIRGoogleMapManager.m

@@ -54,6 +54,7 @@ - (UIView *)view
 RCT_EXPORT_VIEW_PROPERTY(rotateEnabled, BOOL)
 RCT_EXPORT_VIEW_PROPERTY(scrollEnabled, BOOL)
 RCT_EXPORT_VIEW_PROPERTY(pitchEnabled, BOOL)
+RCT_EXPORT_VIEW_PROPERTY(showsUserLocation, BOOL)
 RCT_EXPORT_VIEW_PROPERTY(onPress, RCTBubblingEventBlock)
 RCT_EXPORT_VIEW_PROPERTY(onLongPress, RCTBubblingEventBlock)
 RCT_EXPORT_VIEW_PROPERTY(onChange, RCTBubblingEventBlock)