refactor: dedicated commands moved to kafka

[jackdelahunt]

Moves rhoas dedicated -> rhoas kafka openshift-cluster. rhoas kafka oc is also a valid alias but does not appear in help menu when the command is not hidde.

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation change
• [ ] Other (please specify)