Adding viewmodel and composable for tile layout refactor

Added the start of the tile composable with only the background colors and labels.
Missing the rest of the UI elements, clicks/long clicks, logging, etc.

Bug: 331598956
Flag: ACONFIG com.android.systemui.qs_ui_refactor DEVELOPMENT
Test: TileGridViewModelTest
Test: adb shell am start -n com.android.systemui/com.google.android.systemui.qs.ui.activity.QSActivity

Change-Id: I3ced8ee1d315ce5d2e98ae785ad19a1669a9f51a