1/ Create Reader/Writer for flicker result

A later CL will replace the current flicker results by these reader/writer components

Also unify all android.support.annotation to androidx.annotation as per https://developer.android.com/jetpack/androidx/migrate guidelines

Incl. tests

Fixes: 255715397
Fixes: 259382394
Fixes: 259251690
Test: atest FlickerLibTest
Change-Id: I1047f1821e6d3706f79907f1d6adbc7a3454efeb
18 files changed