fix(core): Avoid using Object.keys on Buffer and other non-plain objects (#6131)

* create a unified way to check if an object is empty

* avoid running `Object.keys` on Buffer objects, to avoid unnecessary memory usage

packages/workflow/src/index.ts

@@ -23,7 +23,15 @@ export * from './WorkflowErrors';
 export * from './WorkflowHooks';
 export * from './VersionedNodeType';
 export { LoggerProxy, NodeHelpers, ObservableObject, TelemetryHelpers };
-export { deepCopy, jsonParse, jsonStringify, sleep, fileTypeFromMimeType, assert } from './utils';
+export {
+	isObjectEmpty,
+	deepCopy,
+	jsonParse,
+	jsonStringify,
+	sleep,
+	fileTypeFromMimeType,
+	assert,
+} from './utils';
 export {
 	isINodeProperties,
 	isINodePropertyOptions,