Extract embedded proguard specs from JARs and AARs during R8#460

snazhmudinov wants to merge 2 commits intobazelbuild:mainbazelbuild/rules_android:mainfrom

snazhmudinov:extend-r8-proguard-extractorsnazhmudinov/rules_android:extend-r8-proguard-extractorCopy head branch name to clipboard