Directly show inputs and outputs for Services/Topics/Actions

[Oberacda]

Services/Topics/Actions get a Request/Response or Message as input or output. This PR changes it so that the fields of the messages are shown directly on the node.

[github-actions[bot]]

Test Results

  3 files  ±0    3 suites  ±0   41s :stopwatch: ±0s 202 tests ±0  202 :white_check_mark: ±0  0 :zzz: ±0  0 :x: ±0  591 runs  ±0  591 :white_check_mark: ±0  0 :zzz: ±0  0 :x: ±0 

Results for commit 33327506. ± Comparison against base commit bf3fea0a.

:recycle: This comment has been updated with latest results.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 41.68126% with 333 lines in your changes missing coverage. Please review.

Project coverage is 46.80%. Comparing base (bf3fea0) to head (3332750). Report is 7 commits behind head on dev.

Files with missing lines	Patch %	Lines
ros_bt_py/ros_bt_py/ros_nodes/action.py	12.39%	303 Missing and 1 partial :warning:
ros_bt_py/ros_bt_py/ros_nodes/service.py	85.20%	24 Missing and 5 partials :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #100      +/-   ##
==========================================
- Coverage   50.92%   46.80%   -4.12%     
==========================================
  Files          58       58              
  Lines        7348     8915    +1567     
  Branches     1604     2250     +646     
==========================================
+ Hits         3742     4173     +431     
- Misses       3540     4626    +1086     
- Partials       66      116      +50     

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