[flexiglass] Integrate Privacy Chip into Flexiglass Shade Header

Integrates the privacy chip into Shade Header in flexiglass, by creating a new repository to expose the necessary state change callbacks as StateFlows. The UI is reused using AndroidView.

Bug: 324239469
Test: TBD
Flag: ACONFIG com.android.systemui.scene_container DEVELOPMENT
Change-Id: Ib733b8600f5d5c16cd7e88b1ab26f3899d1c6905
19 files changed