[Pandora] Add control over BREDR connections

Determine whether we want to connect and pair automatically (which is
what most profiles want), connect and pair manually (if we are testing
pairing), or just connect (if we just want the ACL link).

Ideally we'd have Connect and Pair as entirely independent operations,
but this is impossible to implement on Android. So we are making a
slight compromise of interface purity for the sake of pragmatism. The
alternative, which we used to do, was to make Connect always do an
auto-bond on Android, but that makes the Pair() method basically
useless.

Bug: 248814583
Test: existing pts

Change-Id: I30e858973537e4e61f8c65e9fa771edc11820a9b