[Settings] Support master switch of inline toggle of Settings Injection v2

Allow developers to inject MasterSwitchPreference, a switch
preference with two tap targets, to Settings page.

Developers should declare keyhint and switch_uri for the activity
in AndroidManifest,and then implement a SwitchesProvider.

Bug: 132808482
Test: robotest
Change-Id: I64cdf18268be0cfcd38aab2c059144536dd79b32