feat: formatting of notification message

- added function to get the value of a specified key in the serialized
DataService object by the full access path
- formatting notification message in "onNotify" function

frontend/src/utils/nestedObjectUtils.ts

@@ -0,0 +1,45 @@
+type Data = {
+  [key: string]: any;
+};
+
+const STANDARD_TYPES = [
+  'int',
+  'float',
+  'bool',
+  'str',
+  'Enum',
+  'method',
+  'NoneType',
+  'Quantity'
+];
+
+export function getDataServiceJSONValueByPathAndKey(
+  data: Data,
+  path: string,
+  key = 'value'
+): string {
+  // Split the path into parts
+  const parts = path.split(/\.|(?=\[\d+\])/);
+  parts.shift(); // Remove the first element
+
+  // Traverse the dictionary according to the path parts
+  for (const part of parts) {
+    if (part.startsWith('[')) {
+      // List index
+      const idx = parseInt(part.substring(1, part.length - 1)); // Strip the brackets and convert to integer
+      data = data[idx];
+    } else {
+      // Dictionary key
+      data = data[part];
+    }
+
+    // When the attribute is a class instance, the attributes are nested in the
+    // "value" key
+    if (!STANDARD_TYPES.includes(data['type'])) {
+      data = data['value'];
+    }
+  }
+
+  // Return the value at the terminal point of the path
+  return data[key];
+}