move python inference to Azaion.Inference folder

Azaion.Inference/annotation.pyx

@@ -0,0 +1,35 @@
+import msgpack
+
+cdef class Detection:
+    def __init__(self, double x, double y, double w, double h, int cls, double confidence):
+        self.x = x
+        self.y = y
+        self.w = w
+        self.h = h
+        self.cls = cls
+        self.confidence = confidence
+
+    def __str__(self):
+        return f'{self.cls}: {self.x:.2f} {self.y:.2f} {self.w:.2f} {self.h:.2f}, prob: {(self.confidence*100):.1f}%'
+
+cdef class Annotation:
+    def __init__(self, long time, list[Detection] detections):
+        self.time = time
+        self.detections = detections if detections is not None else []
+        self.image = b''
+
+    cdef bytes serialize(self):
+        return msgpack.packb({
+            "i": self.image,  # "i" = image
+            "t": self.time,  # "t" = time
+            "d": [  # "d" = detections
+                {
+                    "x": det.x,
+                    "y": det.y,
+                    "w": det.w,
+                    "h": det.h,
+                    "c": det.cls,
+                    "p": det.confidence
+                } for det in self.detections
+            ]
+        })