Remove ShellInit/ShellCommandHandler interfaces to SysUI

- SysUI now calls init/commands/dump via the ShellController interface
- Move ShellInit/ShellCommandHandler into the sysui package since it's
  only called on sysui startup

Test: atest WMShellUnitTests
Test: atest SystemUITests
Bug: 238217847
Change-Id: I7b05dbab7648cb8a8c6f9381b0b5f545ed3398f1

packages/SystemUI/src/com/android/systemui/SystemUIInitializer.java

@@ -96,7 +96,6 @@ public abstract class SystemUIInitializer {
                     .setSplitScreen(mWMComponent.getSplitScreen())
                     .setOneHanded(mWMComponent.getOneHanded())
                     .setBubbles(mWMComponent.getBubbles())
-                    .setShellCommandHandler(mWMComponent.getShellCommandHandler())
                     .setTaskViewFactory(mWMComponent.getTaskViewFactory())
                     .setTransitions(mWMComponent.getTransitions())
                     .setStartingSurface(mWMComponent.getStartingSurface())
@@ -112,7 +111,6 @@ public abstract class SystemUIInitializer {
                     .setSplitScreen(Optional.ofNullable(null))
                     .setOneHanded(Optional.ofNullable(null))
                     .setBubbles(Optional.ofNullable(null))
-                    .setShellCommandHandler(Optional.ofNullable(null))
                     .setTaskViewFactory(Optional.ofNullable(null))
                     .setTransitions(new ShellTransitions() {})
                     .setDisplayAreaHelper(Optional.ofNullable(null))