Minor frame fixes for the tool connection joint and gripper camera

[hello-garv]

Addresses #5
Key Changes:

• Update the frame associated with the quick connect interface to be an identity transform to the tool connection site link
• Update the gripper camera frames to follow the same convention as the other cameras (rule 4)

To Test:

• Visualize the robot model with stretch_description (you made need to launch rviz separately):
  ros2 launch stretch_description display.launch.py
• Check that the gripper looks visually correct, and the joint slide bars move the joints as expected
• In the drop down menus, select "Show Axes" for the tool_attachment_site_link and quick_connect_interface_link. Confirm these links are perfectly overlapping.

• In the drop down menus, select "Show Axes" for the gripper_camera_link, gripper_left_camera_color_optical_frame, gripper_right_camera_color_optical_frame, and gripper_stereo_camera_color_optical_frame. Confirm the gripper_camera_link has x pointing out of the camera towards the fingers, and the three optical axes have z pointing out of the camera, towards the fingertips.

• Launch stretch_collision_viz. Visually inspect the collision meshes to make sure they look as expected.