OPNSense widget (#730)

* Opnsense widget (#2)

* OPNSense widget : initial version, memory usage is inaccurate.

* OPNSense widget : code cleanup in widget.js. Firewall is no longer displayed, so it did not need to be queried.

* Opnsense widget (#3)

* OPNSense widget : initial version, memory usage is inaccurate.

* OPNSense widget : code cleanup in widget.js. Firewall is no longer displayed, so it did not need to be queried.

* OPNSense widget : fixing the CPU code to make it more reliable.

* OPNSense widget : fixing the CPU code to make it more reliable. Removing uptime info

* Update src/widgets/opnsense/component.jsx

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

* Update public/locales/en/common.json

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

* Update src/widgets/opnsense/component.jsx

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

* Update src/widgets/opnsense/component.jsx

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

src/widgets/opnsense/widget.js

@@ -0,0 +1,24 @@
+
+import genericProxyHandler from "utils/proxy/handlers/generic";
+
+const widget = {
+  api: "{url}/api/{endpoint}",
+  proxyHandler: genericProxyHandler,
+
+  mappings: {
+    activity: {
+      endpoint: "diagnostics/activity/getActivity",
+      validate: [
+        "headers"
+      ]
+    },
+    interface: {
+      endpoint: "diagnostics/traffic/interface",
+      validate: [
+        "interfaces"
+      ]
+    }
+  },
+};
+
+export default widget;