Add a virtual service conditioned on istio
In order to more easily access installed services, we should conditionally expose them via istio virtual services.
We should expand the values to include istio information and a domain and add a bigbang
folder to the chart templates which includes a virtual service definition.
Most other bigbang charts follow this same pattern ex. Tempo. We could also consider adding auth policies and network policies, but those may not be necessary at this time.