Add exam answer submission DTOs

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

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+package com.example.questionbank.web.rest.dto;
+
+import com.example.questionbank.domain.enumeration.OptionKey;
+import jakarta.validation.constraints.NotNull;
+
+public record SubmitAnswerRequest(@NotNull Long questionId, OptionKey selectedOption) {}

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

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+package com.example.questionbank.web.rest.dto;
+
+import jakarta.validation.Valid;
+import jakarta.validation.constraints.NotEmpty;
+import java.util.List;
+
+public record SubmitExamRequest(@NotEmpty List<@Valid SubmitAnswerRequest> answers) {}