Ros2 doctor should show middleware details

[rotu]

Feature request

Feature description

ros2 doctor should list middleware name and library versions. This is useful troubleshooting info, and it would be great to have it available to paste into issue reports.

Implementation considerations

The names of the relevant libraries and system packages are not currently part of the RMW interface, and it may make sense to add some version info alongside rmw_get_implementation_identifier. Also, it’s important to communicate things like whether rmw_opensplice_cpp is using libopensplice67 vs libopensplice69.

[rotu]

Based on a good idea by @SteveMacenski

[claireyywang]

I'm adding RMW name for now. More detailed info will be added either after I get more familiar with the cpp code base or by community effort.