Public Preview: Application Gateway for Containers Istio Service Mesh integration

Application Gateway for Containers now supports integration with Istio service mesh through an optional service mesh extension. This feature simplifies secure north-south communication between external clients and services within the service mesh. * **Single solution:** Load balance traffic to services both inside and outside the mesh through one ingress gateway. * **Reduced operational overhead:** Eliminate configuration bloat by automating repetitive mutual authentication definitions. * **Certificate trust and rotation:** Managed certificate trust and rotation to maintain secure authentication with the service mesh. **Learn more:** * [Application Gateway for Containers + Istio service mesh](https://aka.ms/agc/istio) * [Application Gateway for Containers Overview](https://aka.ms/agc)