Improve diagnostics of Controllers, Hardware Components and Controller Manager

[saikishor]

This PR in general aims to improve the diagnostics of the ros2_control

[codecov]

Codecov Report

Attention: Patch coverage is 73.52941% with 9 lines in your changes missing coverage. Please review.

Project coverage is 86.72%. Comparing base (b2794d0) to head (9b65621).

Files with missing lines	Patch %	Lines
controller_manager/src/controller_manager.cpp	73.52%	4 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1764      +/-   ##
==========================================
- Coverage   86.76%   86.72%   -0.05%     
==========================================
  Files         116      116              
  Lines       10718    10749      +31     
  Branches      981      989       +8     
==========================================
+ Hits         9300     9322      +22     
- Misses       1064     1068       +4     
- Partials      354      359       +5     

Flag	Coverage Δ
unittests	86.72% <73.52%> (-0.05%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
.../include/controller_manager/controller_manager.hpp	100.00% <ø> (ø)
controller_manager/src/controller_manager.cpp	77.06% <73.52%> (-0.17%)	⬇️

[christophfroehlich]

LGTM

[destogl]

Small change, otherwise good.