Clean up task stack listeners

- Have shell provided a task stack listener that various controllers can
  add to, and remove registration from outside the controllers (this
  also removes methods on the interface exposed only for use from the
  task stack listeners)
- Move copy of InputConsumerController into shell (shared lib version
  can probably be refactored into use just by launcher for gesture nav)
- Hide remaining wm components that are exposed now that all the
  features are in the Shell

Bug: 169894807
Test: atest WMShellUnitTests WMShellTest
Test: Verify Pip/Split/One handed still behaves as expected
Change-Id: If0f50f6b701ac4b013a9e41fe6f88857ea35bf5b