Adds istio e2e

[jcchavezs]

We can leverage External Authorization as in https://istio.io/latest/docs/tasks/security/authorization/authz-custom/

[jonathancouchman]

I was looking to see if OpenFGA supports a native integration with Istio (via external authorization filter?). Is this requirement something to do with that or is it something else?

[jcchavezs]

@jonathancouchman there is this WIP to show how to use openfga in istio #8. One thing we are still missing is the reconciler to get all cluster objects into openfga model. See #6