Add exam question and choice view DTOs

src/main/java/com/example/questionbank/web/rest/dto/ChoiceView.java

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+package com.example.questionbank.web.rest.dto;
+
+import com.example.questionbank.domain.enumeration.OptionKey;
+
+public record ChoiceView(OptionKey optionKey, String content, Integer displayOrder) {}

src/main/java/com/example/questionbank/web/rest/dto/ExamQuestionView.java

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+package com.example.questionbank.web.rest.dto;
+
+import java.util.List;
+
+public record ExamQuestionView(Long questionId, String prompt, List<ChoiceView> choices) {}