Allow copying roles between tenants from the UI

Feature: Allow copying roles between tenants from the Auth0 UI.

Description:
We use a few tenants in our deployment, one for staging and one for production.
We create the roles and the permissions on the staging tenant from the UI.
When we complete the tests on staging we want to deploy the new configuration to the production tenant. Currently to do that we have to manual copy each config change between the environments. This is an error prone and tedius process.

Use-case: We are building a B2B SaaS application, and creating our RBAC mechanism with Auth0