Plugin configuration can randomly fail in case of method overloading as it doesn't take into account implementation attribute

Originally discovered via a Jetty bug report see https://github.com/jetty/jetty.project/issues/11732

The bean to configured have the following overloading method naming:

• public void setExtraClasspath(String extraClasspath)
• public void setExtraClasspath(List<Resource> extraClasspath)

The plugin configuration:

<webApp>
<extraClasspath>${basedir}/config</extraClasspath>
</webApp>

even forcing the implementation attribute doesn't help

<webApp>
<extraClasspath implementation="java.lang.String">${basedir}/config</extraClasspath>
</webApp>

The fix is implemented via the PR https://github.com/eclipse/sisu.plexus/pull/52