Resolve "Make assignment with modules endpoint."

What does this MR do (summary)?

See #154 (closed) for desc.

What changes have you made (detailed)?

1.) Added an endpoint to fetch the necessary information 2.) Added tests

Does this MR meet the acceptance criteria?

• The main application was run to make sure the server still runs without errors.
• Tests were written to verify the behaviour of this code.
• Javadoc and other comments were added to make the code understandable.
• The code adheres to the style guidelines.

Closes #154 (closed)

src/main/java/nl/tudelft/labracore/controller/AssignmentController.java

@@ -122,6 +122,18 @@ public class AssignmentController {
 		return View.convert(ar.findAllById(ids), AssignmentDetailsDTO.class);
 	}
 
+	/**
+	 * Gets assignments with their associated modules, which comes with other information in the layer 1 DTO.
+	 *
+	 * @param  ids The ids of the assignments we want the DTO for.
+	 * @return     The ModuleDetailsDTOs for the respective assignments.
+	 */
+	@GetMapping("with-modules")
+	@PreAuthorize("hasAuthority('ASSIGNMENT_READ')")
+	public List<AssignmentModuleDetailsDTO> getAssignmentsWithModules(@RequestParam Set<Long> ids) {
+		return View.convert(ar.findAllById(ids), AssignmentModuleDetailsDTO.class);
+	}
+
 	/**
 	 * Deletes an assignment.
 	 *