* backend/sqlstore split: remove unused GetDashboardPermissionsForUser from sqlstore
* remove debugging line
* backend/sqlstore: move dashboard permission related functions to dashboard service
adds toggle to make a dashboard public
* config struct for public dashboard config
* api endpoints for public dashboard configuration
* ui for toggling public dashboard on and off
* load public dashboard config on share modal
Co-authored-by: Owen Smallwood <owen.smallwood@grafana.com>
Co-authored-by: Torkel Ödegaard <torkel@grafana.com>
