[#390] event based comm example

[elfenpiff]

Notes for Reviewer

• Adds the Rust-version of a more complex event-driven communication example. The idea is that the publisher and subscriber emit explicitly a user-defined event whenever they do something like connect/disconnect/sent sample/receive sample/request history etc. Based on that example a C++ example will follow in a follow up PR. In the example the ports are part of a more generic ExamplePublisher or ExampleSubscriber that also contain an notifier/listener to wait or emit events that are related to them. It also provides a first preview how a high-level iceoryx2 API could look like, where the event notification and the message transport are no longer separated.
• Fixes a Bug in the WaitSet where it went into an infinite loop after the first deadline/interval has passed. The only thing here missing was to store the last time missed_deadlines was called in the deadline queue.

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

References

Relates to #390 Closes #518

[codecov[bot]]

Codecov Report

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

Project coverage is 78.86%. Comparing base (0c3b189) to head (dbf37d1).

Additional details and impacted files

[](https://app.codecov.io/gh/eclipse-iceoryx/iceoryx2/pull/519?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 #519 +/- ## ========================================== - Coverage 78.87% 78.86% -0.02% ========================================== Files 201 201 Lines 24219 24220 +1 ========================================== - Hits 19103 19100 -3 - Misses 5116 5120 +4 ``` | [Files with missing lines](https://app.codecov.io/gh/eclipse-iceoryx/iceoryx2/pull/519?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-bb/posix/src/deadline\_queue.rs](https://app.codecov.io/gh/eclipse-iceoryx/iceoryx2/pull/519?src=pr&el=tree&filepath=iceoryx2-bb%2Fposix%2Fsrc%2Fdeadline_queue.rs&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=eclipse-iceoryx#diff-aWNlb3J5eDItYmIvcG9zaXgvc3JjL2RlYWRsaW5lX3F1ZXVlLnJz) | `89.51% <100.00%> (+0.07%)` | :arrow_up: | ... and [5 files with indirect coverage changes](https://app.codecov.io/gh/eclipse-iceoryx/iceoryx2/pull/519/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=eclipse-iceoryx)

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