DumpViewer first cut

An on-device dumpsys / logcat viewer.

It needs the following 3 permissions in order to access logcat / dumpsys.
    <uses-permission android:name="android.permission.READ_LOGS"/>
    <uses-permission android:name="android.permission.DUMP"/>
    <uses-permission android:name="android.permission.PACKAGE_USAGE_STATS"/>

Use "adb install -r -g DumpViewer.apk" to give the permissions.

Alternatively, you can grant the permissions with "pm grant":
pm grant com.android.dumpviewer android.permission.PACKAGE_USAGE_STATS
pm grant com.android.dumpviewer android.permission.READ_LOGS
pm grant com.android.dumpviewer android.permission.DUMP

Bug: 110088132
Test: manual test

Change-Id: If5aed1e459e67989f6759a2f53c80a26c3eacccf