Binary size on multiple targets

[tgross35]

Based on https://github.com/rust-lang/wg-binary-size/issues/3, we would like to see binary size outputs on a few different targets show up as perf results. Just checking output size should be relatively fast compared to benchmarking so we can probably include any std targets that we can cross compile to, as well as something WASM and a few popular no_std targets.

It would be extra nice if the report could hold expanded details about the size of each section, but that is a bonus rather than a core feature.