Use internal SubManagerService

Use internal subscriptionmanager service to gain access to all active subscriptions regardless its associated profile, then filter by caller profile.
And gate user handle filtering activity with a new feature flag so
that it can be advanced independent from enterprise feature. It should
cause no behavior change because currently no client can assign a SIM to
a profile.

Bug: 296076674
Test: data browsing + voice call + sending sms
Change-Id: Ie851f2c6ed12a70fa67797baa35c7ce62bedbeb7