feat(backend): Entities toegevoegd

Entites Class, Class Join Request, Class Invitation, Assignment, Group en entities om de Dwengo-leerinhoud te modelleren, toegevoegd.

backend/src/entities/content/learning-path.entity.ts

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+import {Embeddable, Embedded, Entity, Enum, OneToOne, Property} from "@mikro-orm/core";
+import {Language} from "./language";
+
+@Entity()
+export class LearningPath {
+    @Enum({items: () => Language})
+    language!: Language;
+
+    @Property({type: "string"})
+    title!: string;
+
+    @Property({type: "longtext"})
+    description!: string;
+
+    @Property({type: "blob"})
+    image!: string;
+
+    @Embedded({entity: () => LearningPathNode, array: true})
+    nodes: LearningPathNode[];
+}
+
+@Embeddable()
+export class LearningPathNode {
+    @Property({type: "string"})
+    learningObjectHruid!: string;
+
+    @Enum({items: () => Language})
+    language!: Language;
+
+    @Property({type: "string"})
+    version!: string;
+
+    @Property({type: "longtext"})
+    instruction!: string;
+
+    @Property({type: "bool"})
+    startNode!: boolean;
+
+    @Embedded({entity: () => LearningPathTransition, array: true})
+    transitions!: LearningPathTransition[];
+}
+
+@Embeddable()
+export class LearningPathTransition {
+    @Property({type: "string"})
+    condition!: string;
+
+    @OneToOne({entity: () => LearningPathNode})
+    next!: LearningPathNode;
+}