RBAC Cookbook needs to be updated to use Auth Validation Directives

[dthyresson]

See: https://redwoodjs.com/cookbook/role-based-access-control-rbac

For v0.37, the way roles re checked has moved into SDLs.

All the examples here need updating.

For example:

requireAuth should not be in the service, but declared on the mutation.

import { db } from 'src/lib/db'
import { requireAuth } from 'src/lib/auth'

const CREATE_POST_ROLES = ['admin', 'author', 'publisher']

export const createPost = ({ input }) => {
  requireAuth({ role: CREATE_POST_ROLES })

  return db.post.create({
    data: {
      ...input,
      authorId: context.currentUser.sub,
      publisherId: context.currentUser.sub,
    },
  })
}