[Physical Keyboard][A11y Page] Add Bounce keys dialog

1.Add dialog for adjust bounce key to different values.
demo video: b/346949547#comment24.
2.Update summary text.
3.When receive update from content uri, update toggle state directly.
4.Rename Controller to more suitable name.

Bug: 346949547
Test: atest SettingsRoboTests
Flag: com.android.settings.keyboard.keyboard_and_touchpad_a11y_new_page_enabled
Change-Id: I94d8d1a77528b13f59b2d67dfa30e17dd177e385