move profiles connection away from main thread

By using the main handler to perform binder task, we may load the app
main thread un-necessarily.
Instead use a lock to prevent race condition and block whatever is the
thread that call into getProfileProxy (delegating the responsibilities
of a slow call to the caller thread management)

Test: atest pts-bot (any test that requires the profiles)
Flag: Exempt refactor
Bug: 367914132
Bug: 370815283
Change-Id: Ib7ad3119375b95938751eeec20081f2455ec01b5