Add is teacher in any active edition endpoint

Labradoor Counter-MR: labradoor!73 (merged)

What does this MR do (summary)?

Adds a new endpoint which returns true/false depending on if a person has the teacher role in any active edition.

What changes have you made (detailed)?

• In AuthorizationController => Add Endpoint
• In AuthroizationControllerTest => Add Test

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.

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

@@ -265,4 +265,17 @@ public class AuthorizationController {
 				clusterRepository.findByIdOrThrow(clusterId).getCohort().getProgram());
 	}
 
+	/**
+	 * Checks whether the given person has any teacher (non-read-only) role within any of the currently active
+	 * editions.
+	 *
+	 * @param  person The Person to check credentials for.
+	 * @return        Whether the given person has the requested permission.
+	 */
+	@GetMapping("/{person}/teacher-in-any-current-edition")
+	public boolean hasTeacherRoleInAnyCurrentEdition(@PathEntity Person person) {
+		return person.getRoles().stream().anyMatch(r -> r.getType().equals(TEACHER) &&
+				r.getEdition().isActive());
+	}
+
 }