Store state of active TileService

These tiles don't get polled on device startup or user change. Persist
their state (minus the icon) and retrieve when the CustomTile is
created.

Add an initialize method for QSTileImpl that gets handled in a
background thread.

Test: manual
Test: atest com.android.systemui.qs
Test: atest TileServiceTest ActiveTileServiceTest BooleanTileServiceTest
Fixes: 176789277
Change-Id: Id7775f4f2df56c25c13e2192d1bb824cb3b6a22a