Use EXTRA_ENTRYPOINT to log entry point for metrics

1. Extra name: EXTRA_ENTRYPOINT
2. Value: integer which is from SettingsEnums.EntryPointType
// access physical keyboard settings through keyboard configured notification entry point
KEYBOARD_CONFIGURED_NOTIFICATION = 0;
// access physical keyboard settings through keyboard settings entry point
KEYBOARD_SETTINGS = 1;
// access physical keyboard settings through connected devices settings entry point
CONNECTED_DEVICES_SETTINGS = 2;

Bug: 271391879
Test: manual and check the device log.
Change-Id: I0d5144790e184eb3374d4615d8874619c372742a