Add caching for UserManager.hasUserRestriction()

This CL adds caching for UserManager.hasUserRestriction() to improve performance. The cache is invalidated when the user restrictions are changed. 44% of binder calls from uncached API belong to hasUserRestriction.

Bug: 350419621
Change-Id: I3a273b7296006adf33a0c7fbbf514b3c475e72f9
Test: atest com.android.server.pm.UserManagerCacheTest
Flag: android.multiuser.cache_user_restrictions_read_only