Support default panel size from visualization template

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Problem to solve

When adding a new dashboard panel in the dashboard editor, every panel is given the same default size. The default size does not match for any of the existing visualization templates resulting in the need to resize the panel.

Proposed solution

• Update the visualization template schema to support default height/width fields
• Update the dashboard designer to use the specified defaults when a new instance of a visualization is added to a dashboard

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• Single stat, Sparkline, Gauge charts
  • Min width: 2
  • Max width: 12
  • Min height: 1
  • Max height: 4
• Line, Area, Bar, Heatmap, Table charts
  • Min width: 3
  • Max width:12
  • Min height: 2
  • Max height: 5