Dynamic Reconfigure porting

Hi Poonam,

I’ve been working with the team on the Navigation2 stack for ROS2 (https://github.com/ros-planning/navigation2). Dynamic Reconfigure is very prevalent throughout this code, so I opened an issue about what we would need to accomplish to replace it in our stack (https://github.com/ros-planning/navigation2/issues/177). I’ve been working in my own fork on an intermediate replacement for Dynamic Reconfigure functionality using the supported ROS2 parameter events and callbacks. I’ll be submitting a PR to our Nav2 repo soon. As I see this as a more temporary replacement, I welcome any contribution and feedback you have to migrating the essential Dynamic Reconfigure features to ROS2.

Thanks,
Brian Wilcox