Ensure runtime-visible annotations are kept

With R8 full mode, these annotations must be explicitly kept as
attributes. Also keep annotation defaults as they may be used at
runtime.

Test: m + presubmit
Bug: 233746531
Merged-In: Ibab630cd8498c5789ebcad6785fda24967df4d61
Change-Id: Icf2cddf89d06d29bdbd000a8216d1b975b5f49d8