feat: change answer submission architecture

src/modules/submissions/entities/submission.entity.ts

@@ -31,6 +31,9 @@ export class Submission {
   })
   status!: SubmissionStatus;
 
+  @Column({ type: 'int', nullable: false, default: 1 })
+  currentQuestionOrder!: number;
+
   @OneToMany(() => SubmissionAnswer, (answer) => answer.submission)
   answers!: Array<SubmissionAnswer>;