Investigate cargo make

[ethanfrey]

I came across cargo make when looking for code coverage CI tools.

Looking at it's readme, it seems like it can run locally or in CI, and has a whole of of power to script steps (which we do now in circle.yaml). As well as having some useful standard setups.

Please try out cargo make for automating the various tasks we do in the CI (so we can run them locally just as easily). This includes building native, building wasm, running unit tests, checking fmt and clippy errors. It would also be good to investigate enabling some code coverage metrics.

[ethanfrey]

Let's analyse this along with #172

We can either use it or close the issue as "won't fix" with a reason (not very helpful). But let's handle it somehow.