[Physical Keyboard] Add intent support for PK layout setting page

This is part of feature for keyboard setting update, which allows gBoard to deep link to layout picker page.
document: go/deeplink_pk_layout_picker

Change-Id: I4277e175be7eed338f855e8144b5531c614e2c04
Bug: 318594345
Flag: com.android.settings.keyboard.keyboard_and_touchpad_a11y_new_page_enabled
Test: verified on Device