CertDialog supports multiple certs

CertDialog supports multiple certs

- Allow user to trust multiple certs in chain in one AlertDialog
- The animation is similar to GrantPermissionsViewHandlerImpl.
  - Fadeout current, Slide-in next cert from the right.
  - Not animate scale as the CustomeView in AlertDialog matchParent
- Refactor CertDialogBuilder into a separate class
- The change for config multiple cert into the dialog is another CL

note: For single cert case when user taps on a system/user cert,
no change is visible to user after this change

Bug: 18224038
Change-Id: I09ee8f683031c800830af4001582882d61cd4974