Chore: Moves common and response into separate packages (#30298)

* Chore: moves common and response into separate packages

* Chore: moves common and response into separate packages

* Update pkg/api/utils/common.go

Co-authored-by: Arve Knudsen <arve.knudsen@gmail.com>

* Chore: changes after PR comments

* Chore: move wrap to routing package

* Chore: move functions in common to response package

* Chore: move functions in common to response package

* Chore: formats imports

Co-authored-by: Arve Knudsen <arve.knudsen@gmail.com>

pkg/api/routing/routing.go

@@ -0,0 +1,27 @@
+package routing
+
+import (
+	"github.com/grafana/grafana/pkg/api/response"
+	"github.com/grafana/grafana/pkg/models"
+	"gopkg.in/macaron.v1"
+)
+
+var (
+	ServerError = func(err error) response.Response {
+		return response.Error(500, "Server error", err)
+	}
+)
+
+func Wrap(action interface{}) macaron.Handler {
+	return func(c *models.ReqContext) {
+		var res response.Response
+		val, err := c.Invoke(action)
+		if err == nil && val != nil && len(val) > 0 {
+			res = val[0].Interface().(response.Response)
+		} else {
+			res = ServerError(err)
+		}
+
+		res.WriteTo(c)
+	}
+}