[#350] Extend dynamic config API

[elfenpiff]

Notes for Reviewer

Pre-Review Checklist for the PR Author

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

Checklist for the PR Reviewer

• 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

Post-review Checklist for the PR Author

1. All open points are addressed and tracked via issues

References

Closes #350

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 32 lines in your changes missing coverage. Please review.

Project coverage is 80.29%. Comparing base (ec6f906) to head (b013e16).

Files	Patch %	Lines
iceoryx2/src/service/dynamic_config/event.rs	0.00%	16 Missing ⚠️
...x2/src/service/dynamic_config/publish_subscribe.rs	0.00%	16 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #352      +/-   ##
==========================================
- Coverage   80.37%   80.29%   -0.08%     
==========================================
  Files         192      192              
  Lines       22537    22569      +32     
==========================================
+ Hits        18113    18121       +8     
- Misses       4424     4448      +24     

Files	Coverage Δ
iceoryx2/src/service/dynamic_config/event.rs	78.82% <0.00%> (-18.28%)	⬇️
...x2/src/service/dynamic_config/publish_subscribe.rs	78.82% <0.00%> (-18.28%)	⬇️

... and 5 files with indirect coverage changes