Accept externally generated JWTs provided via cookie

If there is an external service like an AuthAPI that can generate JWTs and
  hand them over to ClusterCockpit via cookies, CC can be configured to
  accept them

configs/config.json

@@ -29,5 +29,11 @@
                 "startTime": { "from": "2022-01-01T00:00:00Z", "to": null }
             }
         }
-    ]
+    ],
+    "jwts": {
+        "cookieName": "",
+        "forceJWTValidationViaDatabase": false,
+        "max-age": 0,
+        "trustedExternalIssuer": ""
+    }
 }