Create feature factory interface & initial impl.
Creates the abstract class FeatureFactory and an AOSP implementation called Factory. Also creates a static library for generating logtags since we need to use the code generated by the logtags in multiple packages now. BUG: 27751878 Change-Id: I88d826333642d3efc252134c4facb7b1ca014f32 (cherry picked from commit 867bb9c0)
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