Feature: mailcow widget (#3993)

---------

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

src/widgets/mailcow/widget.js

@@ -0,0 +1,14 @@
+import credentialedProxyHandler from "../../utils/proxy/handlers/credentialed";
+
+const widget = {
+  api: "{url}/api/v1/get/{endpoint}",
+  proxyHandler: credentialedProxyHandler,
+
+  mappings: {
+    domains: {
+      endpoint: "domain/all",
+    },
+  },
+};
+
+export default widget;