Wire-up new flexiglass bouncer to work with existing keyguard codde

Checking in the initial version, this will be refined in follow-up CLs that handle transitions and OnDismiss actions better.

Test: everything builds
Bug: 310005730
Flag: ACONFIG com.android.systemui.compose_bouncer DEVELOPMENT
Change-Id: I5cb304d33ab3e26ad23fdbf64ecf5b58e2abd43f
20 files changed