Add device location button in Place Picker activity

[langsmith]

Creating this ticket to track @androideveloper 's request for a way to enable "My location" button in Place Picker page that zooms to user current location

Floating action button would be added to the PlacePickerActivity XML layout and we'd use the Maps SDK's LocationComponent in the activity.

[androideveloper]

Great! In that case Place Picker can replace our custom solution.