Updater topic name can be remapped via CMAKE

[bjv-capra]

closes https://github.com/micro-ROS/micro_ros_diagnostics/issues/19

@norro I took the liberty of creating a PR with what we discussed.

• [x] Update documentation
• [x] move example_analyzers
• [x] rename to output_topics
• [x] rename to input_topics

[codecov-commenter]

Codecov Report

Merging #32 (01a9573) into master (c1a9f53) will decrease coverage by 0.49%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #32      +/-   ##
==========================================
- Coverage   39.02%   38.52%   -0.50%     
==========================================
  Files           2        2              
  Lines         123      122       -1     
  Branches       19       19              
==========================================
- Hits           48       47       -1     
  Misses         61       61              
  Partials       14       14              

Impacted Files	Coverage Δ
..._diagnostic_updater/micro_ros_diagnostic_updater.c	71.21% <ø> (-0.43%)	:arrow_down:

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[bjv-capra]

If it's okay with you, I could try to cover both (bridge and updater) on this PR.

[bjv-capra]

@norro This PR is ready for review (Still needs documentation updates)

What I did is to

• remove the FQDN from the topics in the bridge

`/diagnostics` -> `diagnostics`
`/diagnostucs_uros` -> `diagnostics`

• added arguments to the launch file to be able to modify the namespace as well as to remap the topics.
• Made the hardcoded topic on the updater to be configurable via CMakeLists

Let me know what you think

[bjv-capra]

@norro this PR is ready

[bjv-capra]

@norro friendly ping. I can't merge until you remove your "changes requested" :)