[#401] Lock-free Atomics for 32-bit architectures

[elBoberido]

Notes for Reviewer

This PR enables lock-free atomics for 32-bit architectures. Since all common 32-bit architectures support 8 byte CAS operations, the reader-writer lock implementation is not required.

Pre-Review Checklist for the PR Author

1. [x] Add sensible notes for the reviewer
2. [x] PR title is short, expressive and meaningful
3. [x] Relevant issues are linked in the References section
4. [x] Every source code file has a copyright header with SPDX-License-Identifier: Apache-2.0 OR MIT
5. [x] Branch follows the naming format (iox2-123-introduce-posix-ipc-example)
6. [x] Commits messages are according to this guideline
   • [x] Commit messages have the issue ID ([#123] Add posix ipc example)
   • [x] Commit author matches Eclipse Contributor Agreement (and ECA is signed)
7. [x] Tests follow the best practice for testing
8. [x] Changelog updated in the unreleased section including API breaking changes
9. [x] Assign PR to reviewer
10. [x] All checks have passed (except task-list-completed)

Checklist for the PR Reviewer

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

Post-review Checklist for the PR Author

1. [x] All open points are addressed and tracked via issues

References

Closes #401

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 78.96%. Comparing base (da1ec61) to head (453dada). Report is 5 commits behind head on main.

Additional details and impacted files

[](https://app.codecov.io/gh/eclipse-iceoryx/iceoryx2/pull/403?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=eclipse-iceoryx) ```diff @@ Coverage Diff @@ ## main #403 +/- ## ========================================== - Coverage 78.99% 78.96% -0.04% ========================================== Files 194 194 Lines 22730 22730 ========================================== - Hits 17955 17948 -7 - Misses 4775 4782 +7 ``` | [Files with missing lines](https://app.codecov.io/gh/eclipse-iceoryx/iceoryx2/pull/403?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=eclipse-iceoryx) | Coverage Δ | | |---|---|---| | [iceoryx2-pal/concurrency-sync/src/iox\_atomic.rs](https://app.codecov.io/gh/eclipse-iceoryx/iceoryx2/pull/403?src=pr&el=tree&filepath=iceoryx2-pal%2Fconcurrency-sync%2Fsrc%2Fiox_atomic.rs&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=eclipse-iceoryx#diff-aWNlb3J5eDItcGFsL2NvbmN1cnJlbmN5LXN5bmMvc3JjL2lveF9hdG9taWMucnM=) | `96.19% <ø> (ø)` | | ... and [9 files with indirect coverage changes](https://app.codecov.io/gh/eclipse-iceoryx/iceoryx2/pull/403/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=eclipse-iceoryx)

[elBoberido]

We reached the Cirrus CI limit. Merging anyway since the github CI is our main CI.