[Feature Request] Enable comparisons between sailfish methods within the one run

[paulegradie]

Is your feature request related to a problem? Please describe.
Having to run sailfish benchmarks twice to perform a stats analysis is pretty annoying! It would be great to be able to perform a single run and create a matrix of comparisons. A vs B vs C

Describe the solution you'd like
I'd like to see the ability to perform comparative benchmarks from within the same class where I can provide the comparison details within the SailfishMethodAttribute

Describe alternatives you've considered
You can achieve this currently by running separate executions from the same method name, but this is cumbersome and not dev friendly.