flavour: make commands flavour agnostic

Support running `services setup` and other commands independently of the flavour (e.g. ILS and RDM will have different commands to be run).

The idea is to implemente a similar pattern that done with the commands, but extend the factory to return commands based on flavour. See [comment](https://github.com/inveniosoftware/invenio-cli/pull/310#discussion_r984349698) for more context.