Add `roles` to directory user & profile (#1401)

## Description

Adds `roles` property to directory user and SSO profile to support
multiple roles.

## Documentation

Does this require changes to the WorkOS Docs? E.g. the [API
Reference](https://workos.com/docs/reference) or code snippets need
updates.

- [X] Yes

If yes, link a related docs PR and add a docs maintainer as a reviewer.
Their approval is required.