It would be good to have a karaf feature for jersey

[Apache karaf](https://karaf.apache.org) has a concept called "[karaf features](https://karaf.apache.org/manual/latest/provisioning)" that is used to provide runtime dependencies for OSGi applications.

I have manually created a [jersey karaf feature](https://github.com/steinarb/jersey-karaf-feature#jersey-karaf-feature), because that gives smoother loading and unloading when I have more than one webapp using jersey.

It would be nice if karaf provided its own karaf feature. It's possible to piggyback the feature creation on the maven build process, using the [karaf-maven-plugin](https://karaf.apache.org/manual/latest/#_using_the_karaf_maven_plugin) and attach the feature artifacts to the deployed maven resources.

If there is interest in this, I can look into providing a pull request.