Support Double Tap Power to open camera via config resource

"Quickly open camera" screen was previously replaced by the "Double
Tap Power Button" screen and accessible only if the
feature flag
android.service.quickaccesswallet.launch_wallet_option_on_power_double_tap
was disabled.

This CL introduces the possibility to set, via a config resource, "Quickly open camera" as the double tap power
gesture screen.

Test: atest DoubleTapPowerSettingsTest
Test: atest DoubleTapPowerPreferenceControllerTest
Test: atest DoubleTapPowerSettingsUtilsTest
Test: manually modified config and verified screen and gesture behavior
change
Flag: android.service.quickaccesswallet.launch_wallet_option_on_power_double_tap
Bug: 384794943
Change-Id: I5ab4422da09fa90848c66a41829327494080b5a2

Change-Id: I8e04cac3999a7ed99a611ef084c54bc07a5505dc