Add a script for a very simple object evaluation benchmark.
There could be more advanced ways of measuring the time
per-node or per modifier, but this just loads the file, tags
the active object for a reevaluation, and times how long
that takes.

Eventually it would be nice to have something like this
connected to Open Data, but that can be separate,
maybe just with the same collection of files.

A test with some files I had locally