chore: add a script to compare the actual content of runs across the refactor

The use case for this is quite scoped, and it will most likely get
removed later, but for now, it helps compute two consecutive runs, one
with the current version of the runner, and one post refactor, and
highlight the differences in the report data.

It is expected to be used with ASLR disabled, otherwise all load_bias
will be randomized across runs.

Author: GuillaumeLagrange