Add Database Schema Support

[riipandi]

It will be nice to have if the Authorizer supports the database schema.

This will be useful when using a shared database such as PostgreSQL in one instance.

Since Authorizer using Gorm this will not too hard to implement.

[lakhansamani]

@riipandi yes. That is true but now after so many releases I will have to think about backward compatibility else if tables changes one might not get the required data.