Shape screen communication with the Launcher's app (1/2)

This is a revertx2 of ag/29936752 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: 362237825
Flag: com.android.systemui.shared.new_customization_picker_ui
Change-Id: Ic00639d12258d086b7001b583b5264ef7b67f4f0