XWIKI-10647: Make the Jetty configuration modular

...esources/src/main/resources/jetty/etc/jetty-01-deploy.xml

...ources/src/main/resources/jetty/etc/jetty-02-contexts.xml

...rces/src/main/resources/jetty/etc/jetty-50-requestlog.xml

...es/src/main/resources/jetty/etc/jetty-90-notify-ready.xml

...ol-jetty-resources/src/main/resources/jetty/etc/jetty.xml

...m-tool-jetty-resources/src/main/resources/start_xwiki.bat

...rm-tool-jetty-resources/src/main/resources/start_xwiki.sh

...-jetty-resources/src/main/resources/start_xwiki_debug.bat

...l-jetty-resources/src/main/resources/start_xwiki_debug.sh