feat: enhance QuizSchema and related schemas with new fields and relations

- Updated QuizSchema to expose correctAnswer as a field with a resolver, improving data retrieval for quizzes.
- Introduced new object types for correctAnswer, allowing for flexible data structures (StringType and StringListType).
- Modified createQuiz mutation to automatically associate the current user as centerMentorId, enhancing data integrity.
- Added personalMilestone relation to ScheduleSchema, linking schedules to personal milestones for better tracking.
- Included quiz relation in ServiceSchema, establishing a connection between services and their associated quizzes.
- Updated Prisma types to reflect the new relationships and fields, ensuring consistency across the application.

src/Service/service.schema.ts

@@ -129,6 +129,9 @@ export class ServiceSchema extends PothosSchema {
             return serviceFeedbacks.length > 0
           },
         }),
+        quiz: t.relation('quiz', {
+          description: 'The quiz of the service.',
+        }),
       }),
     })
   }