Iox #14 adjust untyped user header api

[elBoberido]

Pre-Review Checklist for the PR Author

1. Code follows the coding style of CONTRIBUTING.md
2. Tests follow the best practice for testing
3. Branch follows the naming format (iox-#123-this-is-a-branch)
4. Commits messages are according to this guideline
   • Commit messages have the issue ID (iox-#123 commit text)
   • Commit messages are signed (git commit -s)
   • Commit author matches Eclipse Contributor Agreement (and ECA is signed)
5. Update the PR title
   • Follow the same conventions as for commit messages
   • Link to the relevant issue
6. Relevant issues are linked
7. Add sensible notes for the reviewer
8. All checks have passed (except task-list-completed)
9. Assign PR to reviewer

Notes for Reviewer

This PR refactors the user-header untyped API to be able to implement a gateway, which needs to set the user-header on a per sample base.

Additionally, the typed publisher/subscriber get an alias like the untyped ones in order to prevent the user from specifying a BasePublisher/BaseSubscriber.

Lastly, ChunkHeader::userHeader is now untyped like ChunkHeader::userPayload. Later on we can introduce ChunkHeader::userHeaderTyped and ChunkHeader::userPayloadTyped if necessary

Checklist for the PR Reviewer

• Commits are properly organized and messages are according to the guideline
• Code according to our coding style and naming conventions
• Unit tests have been written for new behavior
• Public API changes are documented via doxygen
• Copyright owner are updated in the changed files
• PR title describes the changes

Post-review Checklist for the PR Author

1. All open points are addressed and tracked via issues

References

• Partly closes Reserved chunkinfo user payload header #14

[codecov]

Codecov Report

Merging #665 (6b9f226) into master (a7bc3a0) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #665      +/-   ##
==========================================
+ Coverage   74.37%   74.39%   +0.01%     
==========================================
  Files         319      318       -1     
  Lines       11207    11204       -3     
  Branches     1963     1963              
==========================================
  Hits         8335     8335              
+ Misses       2100     2097       -3     
  Partials      772      772              

Flag	Coverage Δ
unittests	74.34% <100.00%> (+0.01%)	⬆️
unittests_timing	31.22% <0.00%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
...ude/iceoryx_binding_c/internal/cpp2c_publisher.hpp	100.00% <ø> (ø)
iceoryx_posh/include/iceoryx_posh/popo/sample.hpp	57.14% <ø> (ø)
...sh/include/iceoryx_posh/popo/untyped_publisher.hpp	100.00% <ø> (ø)
iceoryx_binding_c/source/c_chunk.cpp	100.00% <100.00%> (ø)
iceoryx_binding_c/source/c_publisher.cpp	85.29% <100.00%> (-0.63%)	⬇️
...h/include/iceoryx_posh/internal/popo/publisher.inl	100.00% <100.00%> (ø)
...posh/include/iceoryx_posh/internal/popo/sample.inl	82.85% <100.00%> (ø)
.../include/iceoryx_posh/internal/popo/subscriber.inl	80.00% <100.00%> (ø)
...e/iceoryx_posh/internal/popo/untyped_publisher.inl	100.00% <100.00%> (ø)
...eoryx_posh/include/iceoryx_posh/popo/publisher.hpp	100.00% <100.00%> (ø)
... and 4 more