[#610] extend benchmarks

[elfenpiff]

Notes for Reviewer

The user shall be able to utilize our benchmarks to test more complex setups. For instance sending a message from a publisher with N subscribers or notify N listeners. The benchmarks were extended to support this use case.

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
• Every source code file has a copyright header with SPDX-License-Identifier: Apache-2.0 OR MIT
• 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)
  • Commit author matches Eclipse Contributor Agreement(and ECA is signed)
• Tests follow the best practice for testing
• Changelog updated in the unreleased section including API breaking changes
• Assign PR to reviewer
• 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

• All open points are addressed and tracked via issues

References

Closes #610

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.86%. Comparing base (d900b9c) to head (49c288e).
Report is 15 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #611      +/-   ##
==========================================
+ Coverage   78.79%   78.86%   +0.06%     
==========================================
  Files         200      200              
  Lines       24443    24443              
==========================================
+ Hits        19260    19277      +17     
+ Misses       5183     5166      -17     

see 11 files with indirect coverage changes