Add pan tilt camera module (#1261)

Add ptz controls for smartcameras.

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Co-authored-by: Teemu R. <tpr@iki.fi>

tests/test_feature.py

@@ -160,12 +160,14 @@ async def test_precision_hint(dummy_feature, precision_hint):
 
 async def test_feature_setters(dev: Device, mocker: MockerFixture):
     """Test that all feature setters query something."""
+    # setters that do not call set on the device itself.
+    internal_setters = {"pan_step", "tilt_step"}
 
     async def _test_feature(feat, query_mock):
         if feat.attribute_setter is None:
             return
 
-        expecting_call = True
+        expecting_call = feat.id not in internal_setters
 
         if feat.type == Feature.Type.Number:
             await feat.set_value(feat.minimum_value)