Add BinderCacheManager: caches Binder & notifies listeners upon death

Adds a BinderCacheManager class, which does the following:
1) Manages a cached Binder node and recreates it when the Binder node dies.
2) Allows Runnables to be associated with the cached Binder,
which will be called when the node dies.
3) Associates the Runnable with an Object key, which can be used to
remove the runnable without needing to keep a separate map
of Object->Runnable pairs when the user unregisters a persistent
listener.

Test: atest CtsTelephonyTestCases FrameworksTelephonyTests:BinderCacheManagerTest
Change-Id: I23a97371435b7aca8153a30997b91bd324a781a0