Project: mulestudio
Issue STUDIO-2603: Add Processor Chain to the palette 
If when using a 'choice' you use a filter inside a 'when' condition, if the filter is not inside a 'processor chain' them the ESB will fail when deploying the app. The processor chain is already supported from the XML we only need to add it to the palette and add the description to the configuration window.
Story points: 8