count ignores
count ignores

I don't like having to compare the number of tests and ignores manually,
so this script helps with that.

If we like, we can run this in CI, after fixing the current problems.

If so, then it would have closed (but doesn't close) #352.

exercism/xrust,sacherjj/rust,sacherjj/rust,sacherjj/rust,petertseng/exercism-rust,petertseng/exercism-rust,exercism/xrust,petertseng/exercism-rust