feat: cli warnings

Author: loks0n

templates/cli/lib/client.js.twig

@@ -132,6 +132,11 @@ class Client {
             },
         }),
       });
+
+      const warnings = response.headers.get('x-{{spec.title | lower}}-warning');
+      if (warnings) {
+          warnings.split(';').forEach((warning: string) => console.warn(warning));
+      }
     } catch (error) {
       throw new {{spec.title | caseUcfirst}}Exception(error.message);
     }