Refine metrics log in infrastructure

- Add interfaces to set/get metrics category in BasePreferenceController
  for descendants having a chance to get it.
- Set metrics category in DashboardFragment
- Automatically log metrics in onPreferenceChange of
  TogglePreferenceController
- Add support for TwoStateButtonPreference in TogglePreferenceController
  to make the preference generic

Bug: 137559984
Test: robotest
Change-Id: Ia7e0d24a3db1991b18e0286d9894570fa71247a3

src/com/android/settings/display/darkmode/DarkModeActivationPreferenceController.java

@@ -16,7 +16,6 @@
 package com.android.settings.display.darkmode;
 
 import android.app.UiModeManager;
-import android.app.settings.SettingsEnums;
 import android.content.Context;
 import android.content.res.Configuration;
 import android.os.PowerManager;
@@ -136,8 +135,7 @@ public class DarkModeActivationPreferenceController extends BasePreferenceContro
     private final View.OnClickListener mListener = new View.OnClickListener() {
         @Override
         public void onClick(View v) {
-            mMetricsFeatureProvider.logClickedPreference(mPreference,
-                    SettingsEnums.DARK_UI_SETTINGS);
+            mMetricsFeatureProvider.logClickedPreference(mPreference, getMetricsCategory());
             final boolean active = (mContext.getResources().getConfiguration().uiMode
                     & Configuration.UI_MODE_NIGHT_YES) != 0;
             mUiModeManager.setNightModeActivated(!active);