[#483] Add --send-copy flag to pub/sub benchmark

[elfenpiff]

Notes for Reviewer

The benchmark did not consider memory operations. It was true zero copy, meaning that the user used the API so that the data is directly produced into the shared memory and then sent. With the --send-copy flag the memory is zero'ed under the hood so that it simulates some memory operations.

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 #483

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.19%. Comparing base (5f6a0dc) to head (0859def).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #484   +/-   ##
=======================================
  Coverage   79.19%   79.19%           
=======================================
  Files         200      200           
  Lines       23716    23716           
=======================================
+ Hits        18781    18783    +2     
+ Misses       4935     4933    -2     

see 6 files with indirect coverage changes