[#1481] byte-wise atomic wrapper to prevent UB

[FerdinandSpitzschnueffler]

Notes for Reviewer

To handle padding bytes in the wrapper ByteAtomic, the new trait AtomicCopy was introduced. It basically provides a method to apply a callback to each offset-size pair of every field of a type.

Pre-Review Checklist for the PR Author

• Add sensible notes for the reviewer
• PR title is short, expressive and meaningful
• Consider switching the PR to a draft (Convert to draft)
  • as draft PR, the CI will be skipped for pushes
• Relevant issues are linked in the References section
• Branch follows the naming format (iox2-123-introduce-posix-ipc-example)
• Commits messages are according to this guideline
  • Commit messages have the issue ID ([#123] Add posix ipc example)
  • Keep in mind to use the same email that was used to sign the Eclipse Contributor Agreement
• Tests follow the best practice for testing
• Changelog updated in the unreleased section including API breaking changes

PR Reviewer Reminders

• Commits are properly organized and messages are according to the guideline
• Unit tests have been written for new behavior
• Public API is documented
• PR title describes the changes

References

Closes #1481

[FerdinandSpitzschnueffler]

The changes to this file were made because the tests didn't compile for reasons other than those stated in the test names.

[codecov]

Codecov Report

❌ Patch coverage is 49.36709% with 80 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.59%. Comparing base (dc1eea2) to head (fbbb874).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
iceoryx2-bb/derive-macros/src/lib.rs	0.00%	58 Missing ⚠️
iceoryx2-bb/elementary-traits/src/atomic_copy.rs	52.17%	22 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1577      +/-   ##
==========================================
- Coverage   77.70%   77.59%   -0.11%     
==========================================
  Files         419      421       +2     
  Lines       40284    40442     +158     
  Branches     1297     1297              
==========================================
+ Hits        31302    31381      +79     
- Misses       7928     8007      +79     
  Partials     1054     1054              

Flag	Coverage Δ
CPP	68.90% <ø> (ø)
Rust	77.27% <49.36%> (-0.11%)	⬇️

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

Files with missing lines	Coverage Δ
iceoryx2-bb/container/src/byte_atomic.rs	100.00% <100.00%> (ø)
iceoryx2-bb/container/src/string/static_string.rs	85.55% <100.00%> (+1.03%)	⬆️
...ceoryx2-bb/elementary-traits/src/zero_copy_send.rs	75.00% <ø> (ø)
iceoryx2-bb/elementary-traits/src/atomic_copy.rs	52.17% <52.17%> (ø)
iceoryx2-bb/derive-macros/src/lib.rs	0.00% <0.00%> (ø)

... and 10 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[elfenpiff]

I think ZeroCopySend is strictly speaking not needed for AtomicCopy. First of all, it does not have any dependencies to ZeroCopySend or things that trait provides and AtomicCopy does not require #[repr(C)]. It could be used also in just one process and the member ordering can be anything.