Add ros2plugin (backport #165)

[mergify]

Add the plugin command together with the list verb to ros2 CLI.

At the moment it produces the following results:

$ ros2 plugin list
demo_plugin_component:
	Plugin(name='ros2_playground::MessageWriterDerived', type='ros2_playground::MessageWriterDerived', base='ros2_playground::MessageWriter')
rviz_default_plugins:
	Plugin(name='rviz_default_plugins/Camera', type='rviz_default_plugins::displays::CameraDisplay', base='rviz_common::Display')
	Plugin(name='rviz_default_plugins/Grid', type='rviz_default_plugins::displays::GridDisplay', base='rviz_common::Display')
	...

while passing the flag --packages only list packages that export plugins and the relative path to the XML file(s ?),

$ ros2 plugin list --packages
demo_plugin_component:
	share/demo_plugin_component/plugins_description.xml
rviz_default_plugins:
	share/rviz_default_plugins/plugins_description.xml

I'd be more than open to discuss actual output and/or output layout.

Note this does not exactly mimic ROS 1 in terms of prints layout nor in terms of use (yet),
e.g. ROS 1 --> rospack plugins --attrib=plugin <base_package_name>.

Fix ros2/ros2cli#328
Replace ros2/ros2cli#340

Signed-off-by: artivis [email protected]

---

This is an automatic backport of pull request #165 done by Mergify.

[mergify]

Cherry-pick of 1a596d6 has failed:

On branch mergify/bp/kilted/pr-165
Your branch is up to date with 'origin/kilted'.

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  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	renamed:    CHANGELOG.rst -> pluginlib/CHANGELOG.rst
	renamed:    CMakeLists.txt -> pluginlib/CMakeLists.txt
	renamed:    cmake/blank.in -> pluginlib/cmake/blank.in
	renamed:    cmake/pluginlib_enable_plugin_testing.cmake -> pluginlib/cmake/pluginlib_enable_plugin_testing.cmake
	renamed:    cmake/pluginlib_export_plugin_description_file.cmake -> pluginlib/cmake/pluginlib_export_plugin_description_file.cmake
	renamed:    cmake/pluginlib_package_hook.cmake -> pluginlib/cmake/pluginlib_package_hook.cmake
	renamed:    include/pluginlib/class_desc.hpp -> pluginlib/include/pluginlib/class_desc.hpp
	renamed:    include/pluginlib/class_list_macros.hpp -> pluginlib/include/pluginlib/class_list_macros.hpp
	renamed:    include/pluginlib/class_loader.hpp -> pluginlib/include/pluginlib/class_loader.hpp
	renamed:    include/pluginlib/class_loader_base.hpp -> pluginlib/include/pluginlib/class_loader_base.hpp
	renamed:    include/pluginlib/class_loader_imp.hpp -> pluginlib/include/pluginlib/class_loader_imp.hpp
	renamed:    include/pluginlib/exceptions.hpp -> pluginlib/include/pluginlib/exceptions.hpp
	renamed:    include/pluginlib/impl/split.hpp -> pluginlib/include/pluginlib/impl/split.hpp
	renamed:    package.xml -> pluginlib/package.xml
	renamed:    pluginlib-extras.cmake -> pluginlib/pluginlib-extras.cmake
	renamed:    test/include/test_base.hpp -> pluginlib/test/include/test_base.hpp
	renamed:    test/include/test_plugins.hpp -> pluginlib/test/include/test_plugins.hpp
	renamed:    test/include/visibility_control.hpp -> pluginlib/test/include/visibility_control.hpp
	renamed:    test/test_package.xml -> pluginlib/test/test_package.xml
	renamed:    test/test_plugins.cpp -> pluginlib/test/test_plugins.cpp
	renamed:    test/test_plugins.xml -> pluginlib/test/test_plugins.xml
	renamed:    test/unique_ptr_test.cpp -> pluginlib/test/unique_ptr_test.cpp
	renamed:    test/utest.cpp -> pluginlib/test/utest.cpp
	new file:   ros2plugin/package.xml
	new file:   ros2plugin/resource/ros2plugin
	new file:   ros2plugin/ros2plugin/__init__.py
	new file:   ros2plugin/ros2plugin/api/__init__.py
	new file:   ros2plugin/ros2plugin/command/__init__.py
	new file:   ros2plugin/ros2plugin/command/plugin.py
	new file:   ros2plugin/ros2plugin/verb/__init__.py
	new file:   ros2plugin/ros2plugin/verb/list.py
	new file:   ros2plugin/setup.py
	new file:   ros2plugin/test/test_copyright.py
	new file:   ros2plugin/test/test_flake8.py
	new file:   ros2plugin/test/test_pep257.py
	new file:   ros2plugin/test/test_xmllint.py

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   pluginlib/src/list_plugins.cpp

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[ahcorde]

Pulls: #279
Gist: https://gist.githubusercontent.com/ahcorde/a32793824c33df6571e995c87182cfd4/raw/bf394e9019dfa3a005aebfa92a89edfea2db91eb/ros2.repos
BUILD args: --packages-above-and-dependencies pluginlib
TEST args: --packages-above pluginlib
ROS Distro: kilted
Job: ci_launcher
ci_launcher ran: https://ci.ros2.org/job/ci_launcher/17263

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