Update registerNetworkScoreCache() to accept a filter type.

Defined a new IntDef in NetworkScoreManager named CacheUpdateFilter
with 3 values. Caches must be registered with a filter value and will
only receive updates based on their registered filter. Actual
filtering implementation will follow.

Test: runtest frameworks-services -c com.android.server.NetworkScoreServiceTest
BUG: 32912120
Change-Id: I8940e0ed1a7bbcb5a81fb3b6a7fafe4fbbc33875