Add annotation for hidden members used by apps.

This annotation will be added to existing hidden methods and fields that are
known to be used by apps.

These annotations will be used to replace the existing hard coded greylist
text files.

See go/hidden-api-annotations for more context.

Test: m
Bug: 110868826

Change-Id: I1b86ad8460525c2896fb84d7f1f95a521f582b9c