Build a dashboard for displaying historical eval results

[dschonholtz]

This is intentionally a little vague.
This will need some critical thinking on how exactly this should be done.
The basic idea is that we should be able to see scores on various benchmarks and we should be able to see them for historical versions of stable and preferably other branches.
This initial issue should be a proposal of how this should be tackled. Probably not any code as of yet.

[dschonholtz]

Currently we are tracking this in a thread for benchmarking on github.
However, something robust is eventually going to be needed.