Add some lifecycle functionality to WindowlessWM

This adds other parts of the window lifecycle (eg. ViewRoot
death, window removal, layout update). Some of the lifecycle
controls are just utilities, but are needed so that they
can be performed out-of-package.

It also shows/hides the surface based on underlying view
visibility. In actual WM, the surface is actually created/
destroyed based on visibility, but this breaks continuity
in WWM because the WWM user should have full control over
it.

Also made this public so it can be subclassed.

Bug: 133381284
Test: manual test in later CLs
Change-Id: Ibd7792c3f52c216089d9b498e3770e100ff24642