Implement autoclick long pressing

When autoclick type is long press, hold action down until
long press is triggered.

Screencast:
  go/screencast-njy3njm5ndczmjk0ntqwohwxzta3ywy1zi03ma

Test: atest AutoclickControllerTest
Bug: 400744833
Flag: com.android.server.accessibility.enable_autoclick_indicator
Change-Id: I48c26b7d86472d0d3b57ffd474a80eafb8209c0b