allow creation of policies at resource creation time

[chicco785]

Is your feature request related to a problem? Please describe.

Ideally a resource owner should be able to attach the policies he wants for his resource directly at creation time.

Describe the solution you'd like

A mechanism that allow to attach policy definition in the header, parse them and inject them in auth api, following the resource creation.

Describe alternatives you've considered
N/A

Additional context
N/A

[chicco785]

A similar solution as the one adopted in #42 could be used. The decision to be taken is how to pass the policy in the header, and what to do if the policy cannot be correctly parsed / validated. Of course policy passed at creation time cannot affect other resources than the ones created!!!