Shape screen communication with the Launcher's app (2/2)

This is a revertx2 of ag/29934361 with the fix of b/376371559

Support querying / preview / apply for the shapes from the Launcher's
app.

Test: Manually tested that it works
Fixes: 376371559
Bug: 348664593
Flag: com.android.systemui.shared.new_customization_picker_ui
Change-Id: I232040f4c3661f149de4c88810e51f6dd8bac9c3