Support /* v8 ignore ... hints

[AriPerkkio]

This package is used by test runners which do not use c8:

• https://jestjs.io/docs/configuration#collectcoverage-boolean
• https://vitest.dev/guide/coverage.html#ignoring-code

It's confusing for end users to have to ignore code using /* c8 ignore next */ when these test runners have nothing to do with c8.

I would suggest to add support for /* v8 ignore ... */ syntax for ignore hints. The old /* c8 ignore ... */ should be preserved for backwards compatibility. I'm happy to implement this.

[SimenB]

Yeah, I think that's a good idea! Happy to take a PR to that effect

[SimenB]

https://github.com/istanbuljs/v8-to-istanbul/releases/tag/v9.2.0