Properly provides plugin configs to backend plugins. Uses v0.16.0 of grafana-plugin-sdk-go- Ref #21512 Ref #19667
Implements initial support for resources using v0.14.0 of SDK. Ref #21512
Adds support for collecting metrics from backend plugins and exposing them thru Grafana's Prometheus metrics endpoint. Enables to check health of backend plugin by using the route `/api/plugins/<plugin id>/health`. Uses sdk v0.6.0. Closes #20984
Moves backend plugin manager to service instead of global functions in backendplugin package. Closes #20053