Add Slices for Enhanced 4G LTE

Add Slices for Enhanced 4G LTE
Enhanced 4G LTE Slice Provider:
Create slice to display appropriate message with further instructions
Enhanced 4G LTE Slice Broadcast Reciver:
1. Change the setting via ImsManager
2. Ask to requery the slice in one second to display updated settings if 1 is valid or display appropriate message

Bug: 79270171
Test: Robotests
Test: Use support-slices-demos-debug.apk to test on device
Change-Id: I48d412de94d5d9f1ad42a299691ec5cf8001c6a1