Spec out the Istio HA configuration

[DnPlas]

Context

This is the first step of having HA support in our Istio. This is inspired by #399

We want to make the gateway provided by the istio-gateway Charm more resilient, particularly to the loss of a Node, by enabling:

• The ingress Deployment to have more than one replica
• The Pods of the ingress Deployment to automatically be scheduled on different nodes

What needs to get done

1. A spec that defines the above, including the changes that have to be done in the istio-operators and the upgrade path.
2. Define which versions of Istio will be affected (currently in use are 1.17-1.22)

Definition of Done

A spec that defines Istio HA.

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-5980.

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[NohaIhab]

specced out and approved in spec KF103