iox-605 Introduce memory namespace

[mossmaurice]

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 messages are signed (git commit -s)
   • 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

• Rename directory from reloctable_pointer to memory
• Rename namespace rp to memory

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

• Closes Refactor Relocatable Pointer and Relative Pointer #605 (partly)

[codecov]

Codecov Report

Merging #1677 (d904a60) into master (908b7e9) will decrease coverage by 0.02%.
The diff coverage is 90.32%.

@@            Coverage Diff             @@
##           master    #1677      +/-   ##
==========================================
- Coverage   76.20%   76.18%   -0.03%     
==========================================
  Files         365      366       +1     
  Lines       14160    14164       +4     
  Branches     2361     2361              
==========================================
  Hits        10791    10791              
- Misses       2580     2581       +1     
- Partials      789      792       +3     

Flag	Coverage Δ
unittests	75.84% <90.32%> (-0.03%)	⬇️
unittests_timing	15.59% <8.06%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
...eoryx_dust/relocatable_pointer/relocatable_ptr.inl	0.00% <ø> (ø)
...clude/iceoryx_hoofs/internal/concurrent/loffli.hpp	100.00% <ø> (ø)
...eoryx_hoofs/internal/memory/pointer_repository.hpp	100.00% <ø> (ø)
...iceoryx_hoofs/internal/memory/relative_pointer.hpp	100.00% <ø> (ø)
...yx_hoofs/internal/memory/relative_pointer_data.hpp	100.00% <ø> (ø)
...yx_hoofs/internal/memory/relative_pointer_data.inl	60.00% <ø> (ø)
...urce/relocatable_pointer/relative_pointer_data.cpp	100.00% <ø> (ø)
...clude/iceoryx_posh/internal/mepoo/shared_chunk.hpp	100.00% <ø> (ø)
...x_posh/internal/mepoo/shm_safe_unmanaged_chunk.hpp	100.00% <ø> (ø)
...ceoryx_posh/internal/popo/ports/base_port_data.hpp	100.00% <ø> (ø)
... and 32 more