ci: add test suite and nightly miri jobs

[shruti2522]

Add cargo test and MIRI test suite to CI

[nekevss]

Honestly, let's try and run MIRI on every PR.

If it doesn't blow up CI runtime, I'd prefer to have the face value safety. We don't run it on Boa because it would take too long, but this is a smaller repo (for now), so we should try running it.

[shruti2522]

Honestly, let's try and run MIRI on every PR.

If it doesn't blow up CI runtime, I'd prefer to have the face value safety. We don't run it on Boa because it would take too long, but this is a smaller repo (for now), so we should try running it.

I agree, MIRI run doesn't blow up the CI runtime as of now, the only exception was the gc_recursion test, which was taking a really long time, but I've resolved that by using cfg(miri) and cfg(not(miri)) flags. We should be good to run it on every PR