Authorization annotations

[bkostrowiecki]

Is your feature request related to a problem? Please describe.
I would like to generate resolvers with @Authorized decorators so generated API is protected by unauthorized access.

Describe the solution you'd like
I would like to have annotaions that add @Authorized decorator to resolvers. For example:

/// @TypeGraphQL.Authorized(create:'admin,editor', read:null, update:'admin,editor', delete:'admin')
model Post {
/* ... */
}

Given example should result in:

• create resolver accepts admin and editor role
• read resolver accepts all users, even unauthorized
• update resolve accepts admin and editor role
• delete accepts only admin role.

Describe alternatives you've considered

• using 3rd party library to add authorization for resolvers as middleware.
• adding @Authorized decorator manually to generated resolvers. All of them are lost after regenerating the code, so it's the worst solution.