Implement Standalone Pretty formatter

[aslakhellesoy]

For the same reasons as #755 and cucumber/react-components#126 we should implement a standalong pretty formatter (in Go). There is a start of this over in pretty-formatter. It's been disabled from the build for a while - not sure if it's worthwhile saving, or if we should just start over from scratch.

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[aslakhellesoy]

I've changed my view on this. We should have native pretty formatters. Users will expect it to be part of the package without having to install a separate tool.

Native pretty formatters should:

• Not try to output the input document structure
• Output based on TestCase (with hooks, backgrounds and examples inlined)
• Use CucumberQuery to look up the keyword to make it look slightly like the input document
• Separate module in the monorepo, with a shared test suite

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