autoclick: Support auto-drag for the panel

Previously, users could only drag the autoclick type panel using direct
touch input, which was difficult for users with limited dexterity who
rely on autoclick functionality.

This change enables panel repositioning through the autoclick system.

Video: http://shortn/_hk0FUZo6BK

Bug: b/416050648
Test: atest
Flag: com.android.server.accessibility.enable_autoclick_indicator
Change-Id: Ic5d5fcde06cdeda4f330818673f792a58ccade57