Add "importer" or model template for file translator

Most commonly to use the TEXTTABLE table function (the replacement for the text connector) the user will need to use a File Translator/File Resource Adapter. Since the file translator only exposes a known set of procedures, this could be as simple as a model copy. The other approach would be to use the translator api to get the metadata from the translator and then turn that into a model.

This is also needed for the WS Translator/WS resource adapter. See TEIIDDES-464