feature: Attach bundled openapi to project artifacts

[bartveenstra]

When invoking bundle on package phase, automatically attach the bundled openapi to project artifacts to easy publishing the specs

[jjjasper]

The bundled spec is published to a directory on a maven repository - but not using maven coordinates or anything - it is just a file in a folder.

bundled openapi is assembled into a zip file, which is attached to project artifacts. There is a requirement to have a folder inside the zip file - name should probably be configurable.