Long press anywhere to enter glanceable hub edit mode

Implemented the long press detector and applied to the glanceable
hub container. When long press is detected, a button will pop up
to enter edit mode.

Bug: b/318533815
Flag: ACONFIG com.android.systemui.communal_hub DEVELOPMENT
Test: on device
Change-Id: I57d274573c8bf3f6d4f0caeb4266d35cec3ac8ff