Multi version catalog

[lburgazzoli]

As today kamelets are packages as a flat collection in a jar file but that makes not possible to have support for a multi version catalog where i.e. one should be able to pick a specific kamelet version.

I think there are a number of options:

• the kamelets file also include a version i.e. aws-s3-${catalog.version}.kamelet.yaml
• the kamelets are added to a folder matching the catalog version, like /kamelets/${catalog.version}/aws-s3.kamelet.yaml

of course, better options may exist :)