Pipeline constructor
      
      Pipeline({ 
    
    
- UserContext? createdBy,
- DateTime? creationTime,
- UserContext? lastModifiedBy,
- DateTime? lastModifiedTime,
- DateTime? lastRunTime,
- String? pipelineArn,
- String? pipelineDescription,
- String? pipelineDisplayName,
- String? pipelineName,
- PipelineStatus? pipelineStatus,
- String? roleArn,
- List<Tag> ? tags,
Implementation
Pipeline({
  this.createdBy,
  this.creationTime,
  this.lastModifiedBy,
  this.lastModifiedTime,
  this.lastRunTime,
  this.pipelineArn,
  this.pipelineDescription,
  this.pipelineDisplayName,
  this.pipelineName,
  this.pipelineStatus,
  this.roleArn,
  this.tags,
});