Refactor ToggleAutoclickPreferenceFragment to improve maintainability

Root cause: There is a bunch of different logic of preferences in ToggleAutoclickPreferenceFragment. It’s hard to implement new features and hard to maintain and hard to be testable.
Solution: Move out logic of ToggleAutoclickPreferenceFragment 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: I5db18d5a0c577ad67d15c2d0169a36a67e9f13db