Update version number to `v3.0` #2399

9 / 19 tasks completed

10 tasks still to be completed

Task	Status
~~Code follows the coding style of [CONTRIBUTING.md][contributing]~~	Completed
~~Tests follow the [best practice for testing][testing]~~	Completed
Changelog updated [in the unreleased section][changelog] including API breaking changes	Completed
Branch follows the naming format (`iox-123-this-is-a-branch`)	Completed
Commit messages have the issue ID (`iox-#123 commit text`)	Completed
Commit author matches [Eclipse Contributor Agreement][eca] (and ECA is signed)	Completed
Relevant issues are linked	Completed
Add sensible notes for the reviewer	Completed
All checks have passed (except `task-list-completed`)	Incomplete
Assign PR to reviewer	Completed
Consider a second reviewer for complex new features or larger refactorings	Incomplete
Commits are properly organized and messages are according to the guideline	Incomplete
Code according to our coding style and naming conventions	Incomplete
Unit tests have been written for new behavior	Incomplete
Public API changes are documented via doxygen	Incomplete
Copyright owner are updated in the changed files	Incomplete
All touched (C/C++) source code files from `iceoryx_hoofs` have been added to `./clang-tidy-diff-scans.txt`	Incomplete
PR title describes the changes	Incomplete
All open points are addressed and tracked via issues	Incomplete