Stack traces test runner: generate artifacts in Rust

[fvictorio]

Everything in #246 can be done without this, but it's going to be uncomfortable in the long run. Without this, we'll have to generate the artifacts from Hardhat (by running the stack traces test once), and then copying them to the EDR side or using the hardhat-core/test subdir as the path.

Things in the CI are even worse, because we would have to either commit the artifacts (no way) or run the Hardhat tests first and then the EDR ones. And the latter won't even work after #307