Dashboards for span queries

[pete-woods]

trafficstars

Is your feature request related to a problem?

Once you can create the sorts of queries that we would find useful (#1571), the next thing is to be able to dashboard them.

Describe the solution you'd like

Similar to the metric dashboards, being able to collect and arrange useful span queries together (including their tables) is very important to us.

[ankitnayan]

@pete-woods this is already possible today. An example query is mentioned at https://github.com/SigNoz/signoz/issues/1571#issuecomment-1277922563

[makeavish]

It's available in SigNoz already so closing this