Tile perf: offload tile state adapter to bg

Also use the new conflatedCallbackFlow for the custom tile binding
flow

Bug: 378661321
Flag: com.android.systemui.qs_new_tiles
Test: manual. record perfetto trace, verify setListening calls are
shorter and less frequent.

Change-Id: I31b6c7743847b20a8cba1d7ff486382a647bebd3