BUG: image_common should NOT be a submodule

[ndahn]

Issue description

image_common should be a be a dependency in e.g. pylon_ros2_camera_component/package.xml, not a submodule. I'm not sure why this was ever approved, but it messes things up if people already have image_common in their workspace (e.g. a fork) as there are now multiple packages with the same name.

Code example about how to reproduce the issue

1. Clone image_common into your workspace
2. Clone pylon-ros-camera into your workspace
3. Run git submodule --init --recursive
4. Try to build your workspace

Error message

RuntimeError: Multiple packages found with the same name "camera_calibration_parsers":
- drivers/pylon_ros_camera/image_common/camera_calibration_parsers
- utils/image_common/camera_calibration_parsers
Multiple packages found with the same name "camera_info_manager":
- drivers/pylon_ros_camera/image_common/camera_info_manager
- utils/image_common/camera_info_manager
Multiple packages found with the same name "image_common":
- drivers/pylon_ros_camera/image_common/image_common
- utils/image_common/image_common
Multiple packages found with the same name "image_transport":
- drivers/pylon_ros_camera/image_common/image_transport
- utils/image_common/image_transport

Hardware setup description

Runtime information

-

Is your camera operational with the Basler pylon Viewer on your platform?

Yes