Refactor AccessibilityControlTimeoutPreferenceFragment to improve maintainability

Root cause: There is a bunch of different logic of preferences in AccessibilityControlTimeoutPreferenceFragment. It’s hard to implement new features and hard to maintain and hard to be testable.
Solution: Move out logic of AccessibilityControlTimeoutPreferenceFragment into controllers to reduce the complexity of the relationship between preference and fragment.

Bug: 197695932
Test: make RunSettingsRoboTests ROBOTEST_FILTER=com.android.settings.accessibility
Change-Id: I22e6e3b9e2f199ac1721fc069690321ad5f7a0d4