UNS schema extension to include Project Nodes

[gstout52]

Description

Our current UNS offering is just the MQTT broker topic hierarchy. This work is to add information gathered from Project Nodes and other nodes collecting data from various sources in Node-RED.

Epic/Story

(https://github.com/FlowFuse/nr-project-nodes/issues/114)

Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate