Slider should announce disabled when interacting with (#335)

* To be continued

* Check for action event and return true for hover event

We are only to announce "disabled" if a Slider receives the onHover
event and is disabled.
Otherwise we do nothing to avoid spamming user with too many redundant
messages.

Also the Slider should return true as the event has been handled.
The docs for this:
https://developer.android.com/reference/android/view/View#onHoverEvent(android.view.MotionEvent)

* Remove redundant call to `String.format`

* Use touch event instead of hover

* React on ACTION_DOWN instead of POINTER_DOWN

Author: BartoszKlonowski

src/android/src/main/java/com/reactnativecommunity/slider/ReactSlider.java

@@ -12,6 +12,7 @@
 import android.graphics.drawable.BitmapDrawable;
 import android.os.Build;
 import android.util.AttributeSet;
+import android.view.MotionEvent;
 import android.view.accessibility.AccessibilityEvent;
 import android.view.accessibility.AccessibilityManager;
 import androidx.appcompat.widget.AppCompatSeekBar;
@@ -142,6 +143,17 @@ public void run() {
     }
   }
 
+  @Override
+  public boolean onTouchEvent(MotionEvent arg0) {
+    super.onTouchEvent(arg0);
+
+    if (arg0.getActionMasked() == MotionEvent.ACTION_DOWN && this.isEnabled() == false) {
+      announceForAccessibility("slider disabled");
+    }
+    // Returns: True if the view handled the hover event
+    return true;
+  }
+
   public void setupAccessibility(int index) {
     if (mAccessibilityUnits != null && mAccessibilityIncrements != null && mAccessibilityIncrements.size() - 1 == (int)mMaxValue) {
       String sliderValue = mAccessibilityIncrements.get(index);