Merge "Introduce a system feature annotation processor" into main am: 389bf1a8

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/3368823



Change-Id: Iaa7d500c95ebb97bd545a9939c32508cb068a454
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>