[#996] Use NonNull<u8> in elementary/BumpAllocator

[dkroenke]

Notes for Reviewer

• Use NonNull<u8> for start adress in 'BumpAllocator'
• Expect NonNull<u8> for start argument in new() and return an Option<BumpAllocator>

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
• Assign PR to reviewer
• All checks have passed (except task-list-completed)

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 #996

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.86%. Comparing base (3021e90) to head (9497c8c).
⚠️ Report is 34 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1319      +/-   ##
==========================================
+ Coverage   77.82%   77.86%   +0.04%     
==========================================
  Files         404      404              
  Lines       38684    38721      +37     
  Branches     1256     1256              
==========================================
+ Hits        30106    30152      +46     
+ Misses       7545     7536       -9     
  Partials     1033     1033              

Flag	Coverage Δ
CPP	68.04% <ø> (ø)
Rust	77.71% <100.00%> (+0.04%)	⬆️

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

Files with missing lines	Coverage Δ
iceoryx2-bb/container/src/flatmap.rs	79.71% <100.00%> (+0.29%)	⬆️
iceoryx2-bb/container/src/queue.rs	90.43% <100.00%> (+0.19%)	⬆️
iceoryx2-bb/container/src/slotmap.rs	90.10% <100.00%> (+0.16%)	⬆️
...ryx2-bb/container/src/string/relocatable_string.rs	69.07% <ø> (ø)
...ceoryx2-bb/container/src/vector/relocatable_vec.rs	81.72% <ø> (ø)
iceoryx2-bb/elementary/src/bump_allocator.rs	100.00% <100.00%> (ø)
iceoryx2-bb/lock-free/src/mpmc/bit_set.rs	94.96% <100.00%> (+0.09%)	⬆️
iceoryx2-bb/lock-free/src/mpmc/container.rs	95.47% <100.00%> (+0.06%)	⬆️
iceoryx2-bb/lock-free/src/mpmc/unique_index_set.rs	93.00% <100.00%> (+0.05%)	⬆️
iceoryx2-bb/lock-free/src/spsc/index_queue.rs	85.40% <100.00%> (+0.24%)	⬆️
... and 3 more

... and 7 files with indirect coverage changes

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