feat(backend): Question + Answer entities toegevoegd; kleine verbeteringen.

backend/src/entities/questions/question.entity.ts

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+import {Entity, Enum, ManyToOne, PrimaryKey, Property} from "@mikro-orm/core";
+import {Language} from "../content/language";
+import {Student} from "../users/student.entity";
+
+@Entity()
+export class Question {
+    @ManyToOne({entity: () => Student, primary: true})
+    author!: Student;
+
+    @PrimaryKey({type: "string"})
+    learningObjectHruid!: string;
+
+    @Enum({items: () => Language, primary: true})
+    learningObjectLanguage!: Language;
+
+    @PrimaryKey({type: "string"})
+    learningObjectVersion!: number = "1";
+
+    @PrimaryKey({type: "datetime"})
+    timestamp!: Date;
+
+    @Property({type: "text"})
+    content!: string;
+}