[Material Next] Update accessibility tool footer style

1. Implement API extends Material Next FooterBarPreference and support Accessibility API for icons
2. Apply solutions to accessibility tools and framework tools in
accessibility settings page.
3. Apply DashboardFragment for Caption preference for xml parser

Bug: 185973304
Test: make RunSettingsRoboTests -j52
Change-Id: I6b80bc80190d6666e3fbcd462442a9f2c0e60bba