iox-#1361 Use shared memory for process alive detection

[elBoberido]

Pre-Review Checklist for the PR Author

1. Code follows the coding style of CONTRIBUTING.md
2. Tests follow the best practice for testing
3. Changelog updated in the unreleased section including API breaking changes
4. Branch follows the naming format (iox-123-this-is-a-branch)
5. Commits messages are according to this guideline
   • Commit messages have the issue ID (iox-#123 commit text)
   • Commit author matches Eclipse Contributor Agreement (and ECA is signed)
6. Update the PR title
   • Follow the same conventions as for commit messages
   • Link to the relevant issue
7. Relevant issues are linked
8. Add sensible notes for the reviewer
9. All checks have passed (except task-list-completed)
10. All touched (C/C++) source code files from iceoryx_hoofs are added to ./clang-tidy-diff-scans.txt
11. Assign PR to reviewer

Notes for Reviewer

This PR refactors the process alive detection by moving it from an IPC message to a timestamp in the shared memory. It is still not optimal but helps with #2040 and should prevent #1374.

Ideally the process alive detection should not depend on a free running thread to update a value but either on the frequency of the actual sent messages or actual crash detection to prevent RouDi from killing applications which are stopped in a debugger.

Checklist for the PR Reviewer

• Commits are properly organized and messages are according to the guideline
• Code according to our coding style and naming conventions
• Unit tests have been written for new behavior
• Public API changes are documented via doxygen
• Copyright owner are updated in the changed files
• All touched (C/C++) source code files from iceoryx_hoofs have been added to ./clang-tidy-diff-scans.txt
• 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 improve process is alive detection #1361

[elBoberido]

@FerdinandSpitzschnueffler @mossmaurice @dkroenke @MatthiasKillat @elfenpiff @budrus feel free to add yourself as reviewer

[codecov]

Codecov Report

Merging #2056 (dda2e7f) into master (775c7ac) will increase coverage by 0.02%.
Report is 2 commits behind head on master.
The diff coverage is 69.41%.

@@            Coverage Diff             @@
##           master    #2056      +/-   ##
==========================================
+ Coverage   80.10%   80.12%   +0.02%     
==========================================
  Files         416      417       +1     
  Lines       16026    16059      +33     
  Branches     2250     2255       +5     
==========================================
+ Hits        12837    12867      +30     
- Misses       2384     2385       +1     
- Partials      805      807       +2     

Flag	Coverage Δ
unittests	79.91% <69.41%> (+0.02%)	⬆️
unittests_timing	15.29% <0.00%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...nternal/roudi/introspection/port_introspection.hpp	100.00% <ø> (ø)
...sh/include/iceoryx_posh/internal/roudi/process.hpp	100.00% <ø> (ø)
...de/iceoryx_posh/internal/roudi/process_manager.hpp	100.00% <ø> (ø)
...eoryx_posh/internal/runtime/ipc_interface_base.hpp	100.00% <ø> (ø)
...yx_posh/internal/runtime/ipc_runtime_interface.hpp	100.00% <ø> (ø)
...iceoryx_posh/roudi/memory/default_roudi_memory.hpp	100.00% <ø> (ø)
...posh/roudi/memory/iceoryx_roudi_memory_manager.hpp	22.22% <ø> (ø)
...eoryx_posh/roudi/memory/roudi_memory_interface.hpp	100.00% <ø> (ø)
...urce/roudi/memory/iceoryx_roudi_memory_manager.cpp	83.87% <100.00%> (+1.72%)	⬆️
iceoryx_posh/source/roudi/process.cpp	100.00% <100.00%> (ø)
... and 6 more

... and 3 files with indirect coverage changes

[elfenpiff]

Looks good, just minor things.