Analyzing and optimizing queries guide

[gingerwizard]

We have a video here from Tom. We need flamegraph and tracing examples as well + examples common paths for improving query performance e.g. rewriting joins. We have some content around dictionaries here and mvs.

[Blargian]

@gingerwizard What still needs to happen here? Does #3182 cover this issue?

[gingerwizard]

No i think we need to outline what a detailed guide contains and assemble the material