Move Cyclone DDS Gateway to Separate Repository

[mossmaurice]

Brief feature description

The Cyclone DDS Gateway is not a first-class citizen and therefore shall be moved to a separate repository.

Detailed information

• Pro:

  • Independently maintainable from iceoryx core
  • Leading to shorter release cycles of iceoryx core
    • DDS Gateway can stay at a older version if no one in the community request an update

• Con:

  • More cumbersome handling due to increased number of repositories

References

• Comes from #590