Convert TaksView to Kotlin

- PS1: Android Studio conversion (unformatted, cannot compile)
- PS2: Fix compilation issues and formatting
- PS3: First pass ready for review
- PS4: Minor changes (Remove Consumer, remove unnecessary null-checks)
- PS5: Removed check() around taskContainers, which is now lateinit and should always be initiailzed. Also ensure TaskView is bound before adding to parent.
- PS6: Move a bunch of getters to use .property style
- PS8: Refacoted RecentsView.applyLoadPlan bind logic, to avoid inflating TaksView, bind, add then immediatley remove
- PS10: Turned more functions to express functions; added an extension function
- PS11: Re-order functions, no code changes
- PS12: Reverted unit express function back to {} style

Bug: 339787593
Test: Manual
Flag: NONE
Change-Id: I75c06cf29718d8f258a4124997bcb054f5eb056f

quickstep/src/com/android/launcher3/uioverrides/QuickstepLauncher.java

@@ -197,6 +197,8 @@ import com.android.systemui.unfold.config.UnfoldTransitionConfig;
 import com.android.systemui.unfold.progress.RemoteUnfoldTransitionReceiver;
 import com.android.systemui.unfold.updates.RotationChangeProvider;
 
+import kotlin.Unit;
+
 import java.io.FileDescriptor;
 import java.io.PrintWriter;
 import java.util.ArrayList;
@@ -586,6 +588,7 @@ public class QuickstepLauncher extends Launcher implements RecentsViewContainer
                         } else {
                             getStateManager().moveToRestState();
                         }
+                        return Unit.INSTANCE;
                     });
                 } else {
                     getStateManager().goToState(NORMAL);