feat: add LoudAudioFeatureExtractor stub

TBC

pipeline/feature_extractors.py

@@ -162,6 +162,19 @@ class RandomFeatureExtractor(FeatureExtractor):
                 start = random.random() * file.duration() - duration
                 self.features.append(Feature(interval=Interval(start=start, duration=duration),
                                              source="random", path=file.path))
+class LoudAudioFeatureExtractor(FeatureExtractor):
+    """Feature extractor for loud audio detection.
+
+    This class is responsible for extracting features corresponding to loud audio in media files.
+
+    Here:
+
+     setup() is used to validate input files & config, and extracting audio
+
+     run() uses pyloudnorm to detect loud audio
+
+     teardown() is used to clean up temporary files created during setup (if specified by config)
+    """
 
     def teardown(self):
         pass