Add HiddenApiLogging sample

The app demonstrates fetching the hidden api logs.

Test: mma -j packages/experimental/HiddenApiLoggingApp
Change-Id: Ia8cfbe3531553783cc8551a6cbfa5437ca1c9f2e
Merged-In: Ia8cfbe3531553783cc8551a6cbfa5437ca1c9f2e
6 files changed