Create os/IpcDataCache

Bug: 219609105

Create os/IpcDataCache as a subclass of PropertyInvalidatedCache.  The
APIs in the new class are the SystemApi for mainline modules.

Note that IpcDataCache.invalidateCache(String) is a new system API,
relative to the list in PropertyInvalidateCache.  The new API is
static, which is the most common use case for invalidateCache calls.

The corresponding CTS test is updated in the next review.  However, it
is also cloned into the current unit test.

Test: * atest FrameworksCoreTests:PropertyInvalidatedCacheTests
 * atest FrameworksCoreTests:IpcDataCacheTest
Change-Id: I83ce97a4154b9065e0686ee99a25c90f955366ff