metric graphs within a dashboard

[mayberryzane]

Summary

• adds the ability to add, edit, view graphs within a single dashboard
  

How did you test this change?

• clicktested locally

Are there any deployment considerations?

• behind highlight admin flag
• dashboard overview page will be worked on next - for now a dashboard can be added directly in postgres

Does this work require review from our design team?

• @julian-highlight to review after this is released (includes backend changes)

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Latest commit: 2095ac5

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[SpennyNDaJets]

Code looks good to me! Just a few questions but feel free to ignore