[#1910] unique id generator concept

[FerdinandSpitzschnueffler]

Notes for Reviewer

This PR adds a UniqueIdGenerator concept to allow different implementations for generating unique IDs.

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
• 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)
  • Keep in mind to use the same email that was used to sign the Eclipse Contributor Agreement
• Tests follow the best practice for testing
• Changelog updated in the unreleased section including API breaking changes

PR Reviewer Reminders

• 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

References

Closes #1910

[codecov]

Codecov Report

❌ Patch coverage is 76.82403% with 54 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.47%. Comparing base (c98c64d) to head (a3a97b7).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...eoryx2/src/unique_id_generator/unique_system_id.rs	40.74%	16 Missing ⚠️
iceoryx2/src/identifiers.rs	54.83%	14 Missing ⚠️
iceoryx2/src/service/resource/mod.rs	33.33%	12 Missing ⚠️
iceoryx2/src/unique_id_generator/mod.rs	76.92%	6 Missing ⚠️
iceoryx2/src/service/mod.rs	80.00%	2 Missing ⚠️
iceoryx2-cxx/src/unique_node_id.cpp	0.00%	1 Missing ⚠️
iceoryx2-gateway/gateway/src/builder.rs	0.00%	1 Missing ⚠️
...ervices/discovery/src/service_discovery/service.rs	75.00%	1 Missing ⚠️
iceoryx2/src/node/mod.rs	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1957      +/-   ##
==========================================
- Coverage   76.53%   76.47%   -0.07%     
==========================================
  Files         452      455       +3     
  Lines       46046    46144      +98     
  Branches     1489     1488       -1     
==========================================
+ Hits        35243    35288      +45     
- Misses       9541     9594      +53     
  Partials     1262     1262              

Flag	Coverage Δ
CPP	62.66% <66.66%> (+0.05%)	⬆️
Rust	76.32% <76.82%> (-0.07%)	⬇️

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

Files with missing lines	Coverage Δ
iceoryx2-bb/posix/src/unique_system_id.rs	79.77% <ø> (-15.74%)	⬇️
iceoryx2-cxx/include/iox2/unique_node_id.hpp	100.00% <100.00%> (ø)
...2-gateway/backend/src/types/service_description.rs	92.00% <100.00%> (ø)
...eoryx2-gateway/gateway/src/discovery/subscriber.rs	53.70% <100.00%> (ø)
iceoryx2-gateway/gateway/src/gateway.rs	80.97% <ø> (ø)
iceoryx2/src/active_request.rs	92.85% <100.00%> (ø)
iceoryx2/src/node/global_management_segment.rs	88.67% <ø> (ø)
iceoryx2/src/port/client.rs	93.02% <100.00%> (+0.02%)	⬆️
iceoryx2/src/port/listener.rs	90.40% <100.00%> (+0.07%)	⬆️
iceoryx2/src/port/notifier.rs	85.82% <100.00%> (-1.02%)	⬇️
... and 27 more

... and 7 files with indirect coverage changes

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