* Adding class stubs for settings search, UI elements.
* - implement searchable settings
- `SettingsController.setupPreferenceScreen` must return a PreferenceScreen
* Remove unneeded SettingsControllerFactory.
* Set query hint, clean up code smell.
* Add search button to MoreController, stop infinite recursion.
* - initialize SearchResultCollection once in Activity.onCreate
* - implement prefernce highlighting after settings search
* - Ensure all Preferences have a key set or else the highlighting effect will have no effect on it.
- remove ExtensionFilterController and SourceFilterController from settingControllersList in SettingsSearchHelper, since those are related to Extensions and not Settings
* Limiting search to settings menu only, localized breadcrumb string, and code cleanup after code review.
* - moved call to SettingsSearchHelper.initPreferenceSearchResultCollection() into SettingsSearchController
* Code review cleanup and refactoring.
* Inlined non-reused key strings.
* Adding more UI polish, add comments for future enhancements.
* - retain search query when navigating *away* from SettingsSearchController
- keep `searchItem` in `expandActionView` state until user goes back (fixes the empty view in `SettingsSearchSearchController` issue)
Co-authored-by: mpm11011 <markuscicero5@gmail.com>
Co-authored-by: lmj0011 <9396189+lmj0011@users.noreply.github.com>
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