[Request] Allow for AUTH_DIRECTIVES_ROLE_KEY to be nested with dot notation

[earthlingdavey]

I am using a library which creates a jwt in the shape of { user: { roles: ... } }

Request / suggestion, to support this format.

Thank you.

[kevdjoff]

I have the same issue. I am using Keycloack that generate roles under: resource_access: { 'account': { roles: [...] } }