chore: minor code quality improvements

Author: pinpong

android/src/main/java/com/rngooglemapsplus/LocationHandler.kt

@@ -27,7 +27,7 @@ private const val INTERVAL_DEFAULT = 600000L
 private const val MIN_UPDATE_INTERVAL = 3600000L
 
 class LocationHandler(
-  val context: ReactContext,
+  private val context: ReactContext,
 ) : LocationSource {
   private val fusedLocationClientProviderClient: FusedLocationProviderClient =
     LocationServices.getFusedLocationProviderClient(context)

android/src/main/java/com/rngooglemapsplus/MapMarkerBuilder.kt

@@ -42,7 +42,7 @@ import java.util.concurrent.ConcurrentHashMap
 import kotlin.coroutines.cancellation.CancellationException
 
 class MapMarkerBuilder(
-  val context: ThemedReactContext,
+  private val context: ThemedReactContext,
   private val mapErrorHandler: MapErrorHandler,
   private val scope: CoroutineScope = CoroutineScope(SupervisorJob() + Dispatchers.Default),
 ) {

android/src/main/java/com/rngooglemapsplus/PlayServicesHandler.kt

@@ -5,7 +5,7 @@ import com.google.android.gms.common.ConnectionResult
 import com.google.android.gms.common.GoogleApiAvailability
 
 class PlayServicesHandler(
-  val context: ReactContext,
+  private val context: ReactContext,
 ) {
   fun playServicesAvailability(): Int {
     val availability = GoogleApiAvailability.getInstance()

android/src/main/java/com/rngooglemapsplus/RNGoogleMapsPlusView.kt

@@ -22,7 +22,7 @@ import com.rngooglemapsplus.extensions.toSize
 
 @DoNotStrip
 class RNGoogleMapsPlusView(
-  val context: ThemedReactContext,
+  private val context: ThemedReactContext,
 ) : HybridRNGoogleMapsPlusViewSpec() {
   private val mapErrorHandler = MapErrorHandler()