Incorporate the new benchmarking suite into CI

[countvajhula]

The new benchmarking suite already generates a nice Scribble report. We just need to run it in Github CI and then push the HTML output to the GitHub Pages site. This requires:

1. A minimal CLI to be able to configure the profile to use
2. An info.rkt file to allow raco to manage dependencies and simplify installation in CI workflows

This is just a starting point to give us a simple feedback loop, and the integration may change a lot in the long term.

See #150 for some WIP.

[countvajhula]

@dzoep published the vlibench library and we now use it as of #150 .