Migrate from Plugin SearchTarget to API search Target [3/3]

- Implement SearchServicePipeline which utilizes system Search services for AllAppsSearch Results
- Parse android.app.search.SearchTarget handling for Shortcut, Slice, Settings and Play results
- Aggregate SearchTargets to a tree structure for in-line Search Results

Bug: 177223401
Test: Manual
Change-Id: Iddc0f3691578fd332cd2df643a237b29f3eccd0d

src/com/android/launcher3/allapps/SearchUiManager.java

@@ -58,6 +58,11 @@ public interface SearchUiManager {
     void setContentVisibility(int visibleElements, PropertySetter setter,
             Interpolator interpolator);
 
+    /**
+     * Called when activity is destroyed. Used to close search system services
+     */
+    default void destroy(){}
+
     /**
      * Returns true if the QSB should be visible for the given set of visible elements
      */