Add a flag for moving UdfpsEnroll* from SystemUI to settings.

The added files in this CL are mostly copied from SystemUI. Enabling the flag SETTINGS_SHOW_UDFPS_ENROLL_IN_SETTINGS with this CL, the udfps enrollment icons and progress bar are shown in settings.

Turn this flag on via adb:
adb shell setprop sys.fflag.override.settings_show_udfps_enroll_in_settings true

There are some known issues that will be fixed in the following CLs, including:
- When the finger is down on the screen and the lighting circle on the sensor is shown, the fingerprint icon is not hidden.
- When rotating the screen, fingerprint location is not right.
- Currently the scale factor is hard coded for pixel 7 pro, we should update the scale factor based on the device, etc.

Test: manually tested on device
Bug: 260617060
Change-Id: I5aede070eb1de9eb3b5e1400d6e51a8523079852