Provide a Generic Endpoint in palette

In earlier versions of the tooling we have a generic endpoint palette item which let the user drop an endpoint to the diagram but did not specify any URI. That way users could use Camel components which are currently not visible in the palette because they are not on the whitelist by just adding the correct URI scheme and adding the correct dependency into the pom.xml dependencies section. Ideally we do it analog to the data transformation palette item. When dropping it on the canvas we open a wizard which lets the user select from the list of camel components and the asks for basic stuff like ID and Description. When Finish is performed we then add the correct dependency to the pom.xml and place the new created endpoint on the diagram.