Add test case to test new APIs

Testing the new APIs as below:
public void setAccessibilityFocusAppearance(int strokeWidth, int color);
public int getAccessibilityFocusStrokeWidth();
public int getAccessibilityFocusColor();

Bug: 141144573
Test: atest AccessibilityFocusAndInputFocusSyncTest

Change-Id: I2c35b84fbf65c2b19037b8a09be27c3de3e05310