Port Python interactive marker tutorials to ROS 2 (#54)

* Port Python interactive marker tutorials to ROS 2

Signed-off-by: Jacob Perron <jacob@openrobotics.org>

* Add missing shutdown call

Signed-off-by: Jacob Perron <jacob@openrobotics.org>

* Enable Python lint tests and fix errors

Signed-off-by: Jacob Perron <jacob@openrobotics.org>

* Use f-strings instead of format_map()

Signed-off-by: Jacob Perron <jacob@openrobotics.org>

* Lint copyright notices

Signed-off-by: Jacob Perron <jacob@openrobotics.org>