Add getter for apps with auth-bound keys

Add a method to get the list of apps that have auth-bound keys bound to
a specific SID.

Bug: 302109605
Test: Manual, installed an app that creates auth-bound keys and observed
      it is included in the list of apps that have auth-bound keys.
      A CtsVerifier is forthcoming.
Change-Id: Id41398bd29e6f80f963b142bb16719761308198e