Adds a new adb command to get shortcuts from shortcut service

Bug: 177344148
Test: atest ShortcutManagerTest1 to ShortcutManagerTest11
      atest CtsShortcutHostTestCases CtsShortcutManagerTestCases
Change-Id: If474c76c737ac877acf2de6647fcbf649cbed9e6
Merged-In: If474c76c737ac877acf2de6647fcbf649cbed9e6

(cherry picked from commit feb46be8a0f2cfb7386ed49aa2db80d3630b2e8f)

Change-Id: If474c76c737ac877acf2de6647fcbf649cbed9e6
4 files changed