Big Bang Bot: Update CODEOWNERS

Action	User	Reason
Add	@alieberman	User added from team charter mission team manifest
Add	@cshannon	User added from team charter mission team manifest
Add	@julian.hair	User added from team charter mission team manifest
Add	@justin.gomez	User added from team charter mission team manifest
Add	@danilo-patrucco	User added from team charter mission team manifest

These changes were automatically generated based on the state stored in the team charter mission team manifest. If these changes are not expected, please refer to updating team charter manifest.