iox-#2289 Add 'iox' prefix to all 'unistd.hpp' entities

[elBoberido]

Notes for Reviewer

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. Changelog updated in the unreleased section including API breaking changes
4. Branch follows the naming format (iox-123-this-is-a-branch)
5. Commits messages are according to this guideline
   • Commit messages have the issue ID (iox-#123 commit text)
   • Commit author matches Eclipse Contributor Agreement (and ECA is signed)
6. Update the PR title
   • Follow the same conventions as for commit messages
   • Link to the relevant issue
7. Relevant issues are linked
8. Add sensible notes for the reviewer
9. All checks have passed (except task-list-completed)
10. Assign PR to reviewer

Checklist for the PR Reviewer

• Consider a second reviewer for complex new features or larger refactorings
• 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
• All touched (C/C++) source code files from iceoryx_hoofs have been added to ./clang-tidy-diff-scans.txt
• PR title describes the changes

Post-review Checklist for the PR Author

1. All open points are addressed and tracked via issues

References

• Relates to Add 'iox' prefix to all functions and types in the platform abstraction #2289

[codecov]

Codecov Report

Attention: Patch coverage is 94.28571% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 78.07%. Comparing base (f6dc4e1) to head (aa6149f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2290      +/-   ##
==========================================
+ Coverage   78.06%   78.07%   +0.01%     
==========================================
  Files         432      432              
  Lines       15912    15920       +8     
  Branches     2303     2303              
==========================================
+ Hits        12421    12429       +8     
  Misses       2644     2644              
  Partials      847      847              

Flag	Coverage Δ
unittests	77.89% <94.28%> (+0.01%)	⬆️
unittests_timing	14.95% <0.00%> (-0.01%)	⬇️

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

Files	Coverage Δ
iceoryx_hoofs/posix/auth/source/posix_user.cpp	76.78% <100.00%> (ø)
iceoryx_hoofs/posix/filesystem/source/file.cpp	32.28% <100.00%> (ø)
...ryx_hoofs/posix/ipc/source/posix_shared_memory.cpp	64.37% <100.00%> (ø)
...oofs/posix/utility/source/system_configuration.cpp	77.77% <100.00%> (ø)
iceoryx_platform/linux/source/grp.cpp	100.00% <100.00%> (ø)
iceoryx_platform/linux/source/unistd.cpp	91.66% <100.00%> (+4.16%)	⬆️
...e/iceoryx_posh/internal/popo/notification_info.inl	100.00% <ø> (ø)
...posh/include/iceoryx_posh/internal/roudi/roudi.hpp	60.00% <ø> (ø)
iceoryx_posh/source/roudi/roudi.cpp	64.91% <100.00%> (ø)
iceoryx_hoofs/posix/auth/source/posix_group.cpp	79.41% <85.71%> (ø)
... and 1 more