Support image_transport in ros2_examples_bazel_installed

[adityapande-1995]

We have the ros2-humble-image-transport package installed in ros2_examples_bazel installed, but that does not appear as a bazel target, and cannot be used as bazel run //tools:ros2 -- run image_transport list_transports.

[adityapande-1995]

Further investigation :
Now that we have ros2 installed from debs, the system and bazel share the same ros distribution.

bazel run //tools:ros2 -- run image_transport list_transports
No executable found

On the system ros2 installtion, I see the following artifacts :

$ cd /opt/ros/humble/ ; find . | grep image_transport

./share/ament_index/resource_index/packages/image_transport
./share/ament_index/resource_index/package_run_dependencies/image_transport
./share/ament_index/resource_index/image_transport__pluginlib__plugin
./share/ament_index/resource_index/image_transport__pluginlib__plugin/image_transport
./share/ament_index/resource_index/parent_prefix_path/image_transport
./lib/libimage_transport_plugins.so
./lib/libimage_transport.so
./lib/x86_64-linux-gnu/libimage_transport.so
./lib/image_transport
./lib/image_transport/list_transports
./lib/image_transport/republish

And in the bazel sandbox I see :

adityapande@dr2:~/.cache/bazel/_bazel_adityapande/2496651f5f25952056a0343f6cd474f5/execroot/ros2_example_bazel_installed/bazel-out/k8-fastbuild/bin/tools/ros2.runfiles/ros2_example_bazel_installed$ find . | grep image_transport
./external/ros2/_opt_ros_humble/share/ament_index/resource_index/packages/image_transport
./external/ros2/_opt_ros_humble/share/ament_index/resource_index/package_run_dependencies/image_transport
./external/ros2/_opt_ros_humble/share/ament_index/resource_index/image_transport__pluginlib__plugin
./external/ros2/_opt_ros_humble/share/ament_index/resource_index/image_transport__pluginlib__plugin/image_transport
./external/ros2/_opt_ros_humble/share/ament_index/resource_index/parent_prefix_path/image_transport

We have the whole lib directory missing things.