refactor(grafana): rework grafana package and make it more modular

pkg/grafana/schema/dashboard_version.go

@@ -0,0 +1,20 @@
+package schema
+
+import "time"
+
+type DashboardVersion struct {
+	ID            uint      `json:"id"`
+	DashboardID   uint      `json:"dashboardId"`
+	UID           string    `json:"uid"`
+	ParentVersion uint      `json:"parentVersion"`
+	RestoredFrom  uint      `json:"restoredFrom"`
+	Version       uint      `json:"version"`
+	Created       time.Time `json:"created"`
+	CreatedBy     string    `json:"createdBy"`
+	Message       string    `json:"message"`
+	Data          any       `json:"data"`
+}
+
+type DashboardVersionListResponse struct {
+	DashboardVersions []DashboardVersion
+}