a11y: Perform acutal scroll function

* Updates cursor position when sending clicks
* Implement handleScroll function, this function will perform scrolling operations at that cursor location.

Video: http://go/scrcast/NTE5MTI0MDM5NDk5Nzc2MHwyMzI4MmQ1Mi0zZQ

Bug: b/393559560
Test: AutoclickControllerTest
Flag: com.android.server.accessibility.enable_autoclick_indicator
Change-Id: Ifd8c54459534b00d3c8a63246564e6d8a5547918