feat(pipeline-task): add pipelineTaskEvent api.

src/pipeline-tasks/models/pipeline-task-event.ts

@@ -1,13 +1,25 @@
+import { Field, ObjectType } from '@nestjs/graphql';
 import { PipelineUnits } from '../enums/pipeline-units.enum';
 import { TaskStatuses } from '../enums/task-statuses.enum';
+import { Type } from 'class-transformer';
 
+@ObjectType()
 export class PipelineTaskEvent {
+  @Field()
   taskId: string;
+  @Field()
   pipelineId: string;
+  @Field()
   projectId: string;
+  @Field(() => PipelineUnits, { nullable: true })
   unit: PipelineUnits | null;
+  @Field()
+  @Type(() => Date)
   emittedAt: Date;
+  @Field()
   message: string;
+  @Field()
   messageType: 'stdout' | 'stderr' | 'stdin';
+  @Field(() => TaskStatuses)
   status: TaskStatuses;
 }