Include mockserver in apps generated for Netweaver

[IObert]

I'm moving this issue from the old repo on behalf of @unkoder-dev

Using the generator for a Netweaver application does not produce the localService folder nor the "start-local" task in package.json. It would be great to have the possibility to add a service metadata.xml and service data in a .json file to be able to run the app locally without backend server.

Among other cases, this would help create examples people can download and run without having to create the backend service in an SAP System.

Original issue:ui5-community/generator-easy-ui5#65