Implemented most of logic behind REST Mock Services

Added dev.sh script to run r11-tools in dev-mode with hot-reload for frontend

Backend/mocked-services/src/main/java/com/r11/tools/controller/MockController.java

@@ -36,14 +36,12 @@ public class MockController {
 
     /**
      * Updates queried message with given set of data
-     * @param body {@link MockedMessageDto} json representation
+     * @param message {@link MockedMessageDto} json representation
      * @return confirmation and 200 OK
      */
     @SneakyThrows
     @PutMapping
-    public ResponseEntity<String> updateMessage(@RequestBody String body){
-        ObjectMapper mapper = new ObjectMapper();
-        MockedMessageDto message = mapper.readValue(body, MockedMessageDto.class);
+    public ResponseEntity<String> updateMessage(@RequestBody MockedMessageDto message){
         return klausService.setMockedResponse(message);
     }