Skip matching for very large uploads

Parser matching becomes increasingly stressful with more and more parsers added. An upload with a very large amount of files (>100k) takes more time to parser match than its processing timeout.

We need to optimise parser matching: #604 (closed)

As a quickfix, we can add a "skip_matching" option to the nomad.json that allows to predefine mainfiles and skip the actual matching of all files.