refactor: Update AffinityResult class to include detection handling

- Added a new `detections` attribute to the `AffinityResult` class to store detection objects used in affinity matrix calculations.
- Introduced a `tracking_detections` method to yield pairs of trackings and their corresponding detections, enhancing the functionality of the class.
- Updated type hints for improved clarity and consistency in the class definition.

affinity_result.py

@@ -1,6 +1,7 @@
 from dataclasses import dataclass
-from typing import Sequence
+from typing import Sequence, Callable, Generator
 
+from app.camera import Detection
 from playground import Tracking
 from beartype.typing import Sequence, Mapping
 from jaxtyping import jaxtyped, Float, Int
@@ -23,12 +24,14 @@ class AffinityResult:
     Trackings used to compute the affinity matrix.
     """
 
-    indices_T: Sequence[int]
+    detections: Sequence[Detection]
     """
-    Indices of the trackings that were used to compute the affinity matrix.
+    Detections used to compute the affinity matrix.
     """
 
+    indices_T: Sequence[int]
     indices_D: Sequence[int]
-    """
+
-    Indices of the detections that were used to compute the affinity matrix.
+    def tracking_detections(self) -> Generator[tuple[Tracking, Detection]]:
-    """
+        for t, d in zip(self.indices_T, self.indices_D):
+            yield (self.trackings[t], self.detections[d])