Cleanup: refactor internal PIC attributes

This change cleans up the PIC code to account for the NonceHandler
change.

 * Attributes of the cache key (e.g., sysprop name) are now attributes
   of the NonceHandler associated with the cache.

 * Dumpsys dumps the handler attributes in a separate section; the
   handler attributes are not dumped with the cache instance.

 * Module+Api is now the canonical way to refer to a cache key.  Using
   a property name is supported but deprecated.

 * Some unused methods have been removed.

 * Dumpsys -brief is now a bit briefer.

Flag: EXEMPT refactor
Bug: 406502093
Test: atest
 * FrameworksCoreTests:PropertyInvalidatedCacheTests
 * FrameworksCoreTests:IpcDataCacheTest
 * CtsOsTestCases:IpcDataCacheTest
Change-Id: I9c89f9bee6f28658b281f0d98429c69882ada9ce