Integrate SDK system feature cache behind a flag

Add the SDK system feature cache to the hasSystemFeature query lookup.
This involves populating the initial cache array in system server, and
handing this as a compact int array (<1KB) to each process via
ApplicationSharedMemory.

Currently, the compact array is copied into Java heap for easy and fast
access. Follow-up work will explore reusing the mapped buffer and
relying on JNI and/or MappedByteBuffer for zero-copy access.

Flag: android.content.pm.cache_sdk_system_features
Bug: 326623529
Test: presubmit
Change-Id: I905e82eb7ae3a6714cb3751280b927f8bb379358