Akri on a plant edge cluster: discovering OPC UA machines

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Akri architecture on a k3s edge cluster: a Configuration is watched by the Akri Controller and Agent; the Agent asks the OPC UA Discovery Handler to find the tablet press, fluid-bed dryer and autoclave OPC UA servers, creates an Instance and a device plugin resource for each, and the Controller creates a broker pod that the kubelet starts with the machine address in environment variables, with one Service per instance.