Add DynamicAndroidInstallationService

DynamicAndroidInstallationService is a framework service to download,
unzip and write DynamicAndroid images. Apps should interact with it
using DynamicAndroidClient. Or, developers can use adb am commmands.

Test: build and run on internal target
Bug: 122015653
Change-Id: I7c834ed37de52840a407fb140743eda1f2bd82e8