Create the display-message-configuration policy
## Purpose
Need to display a message on the lock screen when the device owner is enabled, Need to display a message on the device administrators apps and the disabled settings
## Goals
Need to create a policy to show those messages on the devices
## Approach
Create a policy to show those messages on the device
## Screenshots
## Documentation
Android Developer
https://developer.android.com/reference/android/app/admin/DevicePolicyManager.html#setDeviceOwnerLockScreenInfo(android.content.ComponentName,%20java.lang.CharSequence)https://developer.android.com/reference/android/app/admin/DevicePolicyManager#setLongSupportMessage(android.content.ComponentName,%20java.lang.CharSequence)https://developer.android.com/reference/android/app/admin/DevicePolicyManager#setShortSupportMessage(android.content.ComponentName,%20java.lang.CharSequence)
## Automation tests
- Unit tests
N/A
- Integration tests
N/A
## Security checks
- Followed secure coding standards? (yes)
- Ran FindSecurityBugs plugin and verified report? (no)
- Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets? (yes)
## Related MRs
N/A
## Test environment
Ubuntu 18.04
## Learning
N/A
See merge request entgra/carbon-device-mgt-plugins!109
shamalka
lasanthaDLPDS
Saad Sahibjan
Nipun Nadeen De Silva
Entgra Builder
milanperera
inoshperera
Charitha Goonetilleke
Inosh Perara