introduce audio filters

src/pipecat/frames/frames.py

@@ -584,9 +584,30 @@ class VADParamsUpdateFrame(ControlFrame):
     params: VADParams
 
 
+@dataclass
+class FilterControlFrame(ControlFrame):
+    """Base control frame for other audio filter frames."""
+
+    pass
+
+
+@dataclass
+class FilterUpdateSettingsFrame(FilterControlFrame):
+    """Control frame to update filter settings."""
+
+    settings: Mapping[str, Any]
+
+
+@dataclass
+class FilterEnableFrame(FilterControlFrame):
+    """Control frame to enable or disable the filter at runtime."""
+
+    enable: bool
+
+
 @dataclass
 class MixerControlFrame(ControlFrame):
-    """Base control frame for other mixer frames."""
+    """Base control frame for other audio mixer frames."""
 
     pass