Add feature extraction for task duration

Author: alperkent

src/graphomotor/features/time.py

@@ -0,0 +1,15 @@
+"""Feature extraction module for time-based metrics in spiral drawing data."""
+
+from graphomotor.core import models
+
+
+def get_task_duration(spiral: models.Spiral) -> dict:
+    """Calculate the total duration of a spiral drawing task.
+
+    Args:
+        spiral: Spiral object containing drawing data.
+
+    Returns:
+        Dictionary containing the total duration of the task in seconds.
+    """
+    return {"duration": spiral.data["seconds"].iloc[-1]}