It moves some classes form the Nexus package into the launcher package
so it can be used in both projects.
It also adds more test for foldables and test multiple
grids for each test.
Bug: 289584301
Fix: 291346193
Test: ReorderWidgets
Change-Id: I04db5f685d0344b8a3f3d42b429bbde061b3d8ea
It also adds an assets folder inside of Launcher3 tests.
It also fixes a bug in fullReorder.
Test: atest ReorderWidgets
Flag: none
Bug: 229292911
Change-Id: I7dadd42a3057d353326691163bb7db71a2e9dcc4