Add logging for SettingsPanels

The 3 main categories are:
- Panel Opened
- Panel Closed
- Panel Slice interaction

There are 3 close events:
- See more button
- Done button
- Clicking outside the panel

Slice interactions will log the Uri of the Slice and the ActionType,
such as Toggle, Slider, Content (intent).

Change-Id: Iecad948f39f50dd12ae1bcb23a5d523e0df8bb98
Fixes: 117804231
Test: robotests

tests/robotests/src/com/android/settings/panel/PanelSlicesAdapterTest.java

@@ -71,7 +71,7 @@ public class PanelSlicesAdapterTest {
                                 .getSupportFragmentManager()
                                 .findFragmentById(R.id.main_content));
 
-        mAdapter = new PanelSlicesAdapter(mPanelFragment, mFakePanelContent.getSlices());
+        mAdapter = new PanelSlicesAdapter(mPanelFragment, mFakePanelContent);
     }
 
     @Test