[android] Expose pre-fetching zoom delta. (#15769)

* [android] Expose pre-fetching zoom delta.

* [android] Fix Clang format.

* [android] Add MapboxMap unit test.

* [android] Add prefetching zoom delta into MapboxMapOptions.

* [android] Deprecate setPrefetchesTiles to migrate to setPrefetchZoomDelta.

* [android] Deprecate getPrefetchesTiles() and migrate to setPrefetchZoomDelta().

* [android] Add unit test to NativeMapViewTest.

* [android] Add IntRange annotation to getPrefetchZoomDelta.

platform/android/MapboxGLAndroidSDKTestApp/src/androidTest/java/com/mapbox/mapboxsdk/maps/NativeMapViewTest.kt

@@ -221,6 +221,23 @@ class NativeMapViewTest : AppCenter() {
         assertEquals("Flag should match", expected, actual)
     }
 
+    @Test
+    @UiThreadTest
+    fun testPrefetchZoomDelta() {
+      val expected = 2
+      nativeMapView.prefetchZoomDelta = 2
+      val actual = nativeMapView.prefetchZoomDelta
+      assertEquals("Prefetch zoom delta should match", expected, actual)
+    }
+
+    @Test
+    @UiThreadTest
+    fun testPrefetchZoomDeltaDefault() {
+      val expected = 4
+      val actual = nativeMapView.prefetchZoomDelta
+      assertEquals("Prefetch zoom delta should match", expected, actual)
+    }
+
     @Test
     @UiThreadTest
     fun testSetContentPadding() {