Implements a benchmarking script

[arcanis]

What's the problem this PR addresses?

Making benchmarks required a little too much setup for me, so I made a script to make it seamless.

How did you fix it?

Running yarn bench in the repository will spawn a shell inside a temporary folder, with everything setup to run a benchmark when calling bench-run. It doesn't handle yet parametrized benchmarks, but should support comparing performances before/after.

Incidentally, the yarn set version from sources command now caches the result, to avoid rebuilding the same commits.

Checklist

• I have read the Contributing Guide.

• I have set the packages that need to be released for my changes to be effective.

• I will check that all automated PR checks pass before the PR gets reviewed.