[DOC] How to build your own service graphs using the Node Graph visualisation from Tempo generated metrics

[hedss]

Customers have asked for it in the past, we should really document the queries and a couple of examples of how to build this out in a dashboard panel.

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[ilyamochalov]

@hedss @knylander-grafana I was able to create service graph visualization. All data transformations are done with Prometheus label_join operators. It does most of the job done, but leaves us with limitations that can not be compensated even by Grafana transform data feature. Some limitations:

• unable to add request stats to nodes and edges, such RPS and error rates
• unable to ad custom icons for nodes

Shall I make a PR adding docs to https://github.com/grafana/tempo/tree/main/docs/sources/tempo/metrics-generator/