Feature toggles management: Define get feature toggles api (#72106)

* Feature Toggle Management: Define get feature toggles api

* lint

pkg/api/featuremgmt.go

@@ -0,0 +1,30 @@
+package api
+
+import (
+	"net/http"
+
+	"github.com/grafana/grafana/pkg/api/response"
+	contextmodel "github.com/grafana/grafana/pkg/services/contexthandler/model"
+)
+
+func (hs *HTTPServer) GetFeatureToggles(ctx *contextmodel.ReqContext) response.Response {
+	featureMgmtCfg := hs.Cfg.FeatureManagement
+
+	features := hs.Features.GetFlags()
+	enabledFeatures := hs.Features.GetEnabled(ctx.Req.Context())
+
+	for i := 0; i < len(features); {
+		ft := features[i]
+		if _, ok := featureMgmtCfg.HiddenToggles[ft.Name]; ok {
+			features = append(features[:i], features[i+1:]...) // remove feature
+			continue
+		}
+		if _, ok := featureMgmtCfg.ReadOnlyToggles[ft.Name]; ok {
+			features[i].ReadOnly = true
+		}
+		features[i].Enabled = enabledFeatures[ft.Name]
+		i++
+	}
+
+	return response.JSON(http.StatusOK, features)
+}