Merge branch '33-introduce-custom-growbrosexception-abstract-class' into 'main'

"Introduce custom "GrowBrosException" (abstract class?)"

Closes #33

See merge request !17

src/main/java/hdm/mi/growbros/exceptions/GrowBrosException.java

+package hdm.mi.growbros.exceptions;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.server.ResponseStatusException;
+
+public abstract class GrowBrosException extends ResponseStatusException {
+    /**
+     * Creates a ResponseStatus exception with the given message and a response status of 500 (internal server error)
+     *
+     * @param message Error message
+     */
+    public GrowBrosException(String message) {
+        super(HttpStatus.INTERNAL_SERVER_ERROR, message);
+    }
+
+    public GrowBrosException(HttpStatus httpStatus, String message) {
+        super(httpStatus, message);
+    }
+}

src/main/java/hdm/mi/growbros/exceptions/GrowBrosFatalException.java

+package hdm.mi.growbros.exceptions;
+
+public abstract class GrowBrosFatalException extends Exception {
+    public GrowBrosFatalException(String message) {
+        super(message);
+    }
+}

src/main/java/hdm/mi/growbros/exceptions/PlantNotFoundException.java

 package hdm.mi.growbros.exceptions;
 
-public class PlantNotFoundException extends RuntimeException {
+import org.springframework.http.HttpStatus;
+
+public class PlantNotFoundException extends GrowBrosException {
     public PlantNotFoundException(Long id) {
-        super(String.format("Plant with id '%d' was not found", id));
+        super(HttpStatus.NOT_FOUND, String.format("Plant with id '%d' was not found", id));
     }
 }