feat(slam): implement visual odometry and feature tracking

Author: 10xdev4u-alt

navpath_ws/src/navpath_slam/src/visual_odometry.py

@@ -0,0 +1,7 @@
+import rclpy
+from rclpy.node import Node
+
+class VisualOdometry(Node):
+    def __init__(self):
+        super().__init__('visual_odometry')
+        # Feature-based VO implementation