[#1176] Custom config for iceoryx2-pal-configuration

[dkroenke]

Notes for Reviewer

Adding a new feature flag custom_pal_config to provide a user-defined configuration for the platform abstraction layer.
See config/README.md on information how to use it.

Please test Cargo and Bazel as well.

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
• Every source code file has a copyright header with SPDX-License-Identifier: Apache-2.0 OR MIT
• 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)
  • Commit author matches Eclipse Contributor Agreement(and ECA is signed)
• 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)

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

• All open points are addressed and tracked via issues

References

Relates #1176

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.82%. Comparing base (5fe9be7) to head (8d05a0c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1184      +/-   ##
==========================================
- Coverage   77.84%   77.82%   -0.03%     
==========================================
  Files         360      360              
  Lines       38833    38806      -27     
  Branches      816      309     -507     
==========================================
- Hits        30230    30199      -31     
+ Misses       7956     7953       -3     
- Partials      647      654       +7     

Flag	Coverage Δ
CPP	?
Rust	77.82% <ø> (+0.01%)	⬆️

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

Files with missing lines	Coverage Δ
iceoryx2/src/config.rs	70.61% <ø> (ø)

... and 35 files with indirect coverage changes

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