Operation constructor
      
      Operation({ 
    
    
- List<StatusCondition> ? clusterConditions,
- String? detail,
- String? endTime,
- Status? error,
- String? location,
- String? name,
- List<StatusCondition> ? nodepoolConditions,
- String? operationType,
- OperationProgress? progress,
- String? selfLink,
- String? startTime,
- String? status,
- String? statusMessage,
- String? targetLink,
- String? zone,
Implementation
Operation({
  this.clusterConditions,
  this.detail,
  this.endTime,
  this.error,
  this.location,
  this.name,
  this.nodepoolConditions,
  this.operationType,
  this.progress,
  this.selfLink,
  this.startTime,
  this.status,
  this.statusMessage,
  this.targetLink,
  this.zone,
});