Introduce StartingWindowTypeAlgorithm interface

Extracting StartingWindowTypeAlgorithm static nested class within
StartingWindowController into StartingWidnowTypeAlgorithm interface and
PhoneStartingWindowTypeAlgorithm class that implemets the interface.

Adding an alternative implementation - TvStartingWindowTypeAlgorithm, for
use on TV. The TV implementation always returns StartingWindowTypeAlgorithm.

Setting up TvWMShellModule and WMShellModule to provide the TV and the
Phone implementations respectively.

Also removing a redundant StartingWindowController constructor.

Bug: 182759603
Test: make SystemUI
Change-Id: I10bab125320a9cdc9e3ddaedad1c74930b681fa6