DataSources: Add datasource fetching + querying interface (#80749)

* first pass

* separate oss + enterprise

* tidy things up

* add ctx

* fix tests

* use standalone svcs

* mv plugin context provide

* fix wire

* fix import

pkg/registry/apis/datasource/sub_proxy.go

@@ -8,10 +8,12 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apiserver/pkg/registry/rest"
+
+	"github.com/grafana/grafana/pkg/plugins"
 )
 
 type subProxyREST struct {
-	builder *DataSourceAPIBuilder
+	pluginJSON plugins.JSONData
 }
 
 var _ = rest.Connecter(&subProxyREST{})
@@ -25,7 +27,7 @@ func (r *subProxyREST) Destroy() {}
 func (r *subProxyREST) ConnectMethods() []string {
 	unique := map[string]bool{}
 	methods := []string{}
-	for _, r := range r.builder.plugin.Routes {
+	for _, r := range r.pluginJSON.Routes {
 		if unique[r.Method] {
 			continue
 		}
@@ -40,12 +42,7 @@ func (r *subProxyREST) NewConnectOptions() (runtime.Object, bool, string) {
 }
 
 func (r *subProxyREST) Connect(ctx context.Context, name string, opts runtime.Object, responder rest.Responder) (http.Handler, error) {
-	pluginCtx, err := r.builder.getDataSourcePluginContext(ctx, name)
-	if err != nil {
-		return nil, err
-	}
-
 	return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
-		responder.Error(fmt.Errorf("TODO, proxy: " + pluginCtx.PluginID))
+		responder.Error(fmt.Errorf("TODO, proxy: " + r.pluginJSON.ID))
 	}), nil
 }