Feature request

Required Info:

• Operating System:- Ubuntu 22.04
• ROS2 Version:- Humble
• Version or commit hash:- f87609d
• DDS implementation:- CycloneDDS

Feature description

Currently, the nav2_behaviors package does not install the plugins folder within it, making it inaccessible to downstream packages. This is a request to just add an installation prefix for that folder. This will be helpful for designing custom nav2_behaviors that could inherit the existing functionalities.

Implementation considerations

Adding the following in CMakeLists.txt of nav2_behaviors:

install(DIRECTORY plugins DESTINATION share/${PROJECT_NAME} )

I could submit a quick PR for this unless there was a specific design reason not to make the plugins available.