feat(ax-arm): add AX-series arm robot package

Add the lerobot_robot_ax_arm package with the AXArm robot,
its config, URDF joint mapping, an end-effector keyboard
teleop example, and packaging metadata.

lerobot_robot_ax_arm/pyproject.toml

@@ -0,0 +1,19 @@
+[build-system]
+requires = ["setuptools>=61.0"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "lerobot_robot_ax_arm"
+version = "0.1.0"
+description = "Third-party LeRobot robot: 4-DoF Dynamixel AX-series (Protocol 1.0) arm"
+readme = "README.md"
+requires-python = ">=3.10"
+dependencies = [
+    "lerobot[dynamixel]",
+]
+
+[tool.setuptools.packages.find]
+include = ["lerobot_robot_ax_arm*"]
+
+[tool.setuptools.package-data]
+lerobot_robot_ax_arm = ["urdf/*.urdf"]