Test PiP on TV with different aspect ratios

Introduce TvPipBasicTest that runs a basic Pip scenario:
1) enter Pip;
2) open Pip menu using the Window button;
3) close Pip menu using the Back button;
4) close Pip.
The test runs with 4 times with different Pip window aspect ratios:
defaul; square(1:1); wide(2:1); tall(1:2).

Bug: 13054136
Test: atest WMShellFlickerTests:TvPipBasicPipTest
Change-Id: I9a138ba9daaac223d451bac750e6a028def0a468