Add Photo Picker Settings activity

Create a basic Settings activity that the user can eventually use to
change Could Provider settings. Users can reach the settings fragment
through the overflow menu in PhotoPickerActivity.

Since the Settings fragment is not completely developed yet, the
settings menu item is by default invisible for now.

Bug: 195009187
Test: atest PhotoPickerSettingsTest
Change-Id: I30089436ad49fed1c4cac6e34fb87f91f3540bea
Merged-In: I30089436ad49fed1c4cac6e34fb87f91f3540bea
9 files changed