Add the new dock tooltip for accessibility floating menu.

Goal:
Pop up the tooltip to show how to move the menu and
hide after users move the Accessibility floating menu first.

Patch Action:
1. Create new SharedPrefernece for dock tooltip.

Bug: 182532449
Test: atest AccessibilityFloatingMenuViewTest AccessibilityFloatingMenuTest
AnnotationLinkSpanTest AccessibilityFloatingMenuTooltipViewTest
DockTooltipViewTest MigrationTooltipViewTest

Change-Id: I71d29761acd4e9d48f776e5c701149b3ed40fda4