Track binary size

[therealprof]

I'd like to second that idea. Binary size is a big topic for embedded and I'm sporadically tracking the size of the example binaries from some of my crates using cargo-bloat but having a more methodical way of doing that on a larger test base sounds like a great approach.

[anp]

It is worth noting that some amount of binary size for each benchmark will come from lolbench_support which includes criterion and some other stuff too, so we'll need to account for that baseline when presenting the results.