move from pull to push model for policy data

[chicco785]

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

Currently policy data are pulled from the rego policies, this may create performance issues.

Describe the solution you'd like

When a policy is created or modified the auth api generates a payload to the opa data api. This data are then used to evaluate policies.

Describe alternatives you've considered
N/A

Additional context
N/A

[Cerfoglg]

Closing this, as this was implemented. Issue #196 exists to track further performance optimisation.