[#488] waitset attachment id improvements

[elfenpiff]

Notes for Reviewer

To be able to perform better debugging, the streaming operator for the waitset attachment id was added. Furthermore, std::hash was implemented for it to be able to organize it in a hash map.

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 #488

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.

Project coverage is 79.13%. Comparing base (5f6a0dc) to head (355b962). Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
iceoryx2/src/port/waitset.rs	0.00%	8 Missing :warning:

Additional details and impacted files

[](https://app.codecov.io/gh/eclipse-iceoryx/iceoryx2/pull/489?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 #489 +/- ## ========================================== - Coverage 79.19% 79.13% -0.06% ========================================== Files 200 200 Lines 23716 23724 +8 ========================================== - Hits 18781 18775 -6 - Misses 4935 4949 +14 ``` | [Files with missing lines](https://app.codecov.io/gh/eclipse-iceoryx/iceoryx2/pull/489?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/src/port/waitset.rs](https://app.codecov.io/gh/eclipse-iceoryx/iceoryx2/pull/489?src=pr&el=tree&filepath=iceoryx2%2Fsrc%2Fport%2Fwaitset.rs&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=eclipse-iceoryx#diff-aWNlb3J5eDIvc3JjL3BvcnQvd2FpdHNldC5ycw==) | `75.68% <0.00%> (-1.89%)` | :arrow_down: | ... and [6 files with indirect coverage changes](https://app.codecov.io/gh/eclipse-iceoryx/iceoryx2/pull/489/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=eclipse-iceoryx)