Feature: Prometheus Metric service widget (#4269)

Co-authored-by: shamoon <4887959+shamoon@users.noreply.github.com>

src/widgets/prometheusmetric/widget.js

@@ -0,0 +1,16 @@
+import genericProxyHandler from "utils/proxy/handlers/generic";
+
+const widget = {
+  api: "{url}/api/v1/{endpoint}",
+  proxyHandler: genericProxyHandler,
+
+  mappings: {
+    query: {
+      method: "GET",
+      endpoint: "query",
+      params: ["query"],
+    },
+  },
+};
+
+export default widget;