feat(slam): initialize slam framework and pose graph setup

Author: 10xdev4u-alt

navpath_ws/src/navpath_slam/src/slam_node.py

@@ -0,0 +1,7 @@
+import rclpy
+from rclpy.node import Node
+
+class SLAMNode(Node):
+    def __init__(self):
+        super().__init__('slam_node')
+        # ORB-SLAM3 or Cartographer integration