Fix parser translator ast for heredoc with written newlines #3347
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In parser, the string content is dedented. This implements these rules as far as I was able to understand them. It's all a bit confusing with spaces/tabs, always learning more funny things about them. I refered to the prism implementation, parser seems to adhere to it very closely.
This does a few things: * After a line continuation in a heredoc, emit only a single token * Dedent ` heredocs * Properly handle escapes in single and doublequoted heredocs Some of the heredoc escaping logic should be applied to strings as well, but I'll leave that for a different PR.
Heredocs that contain "\\n" don't start a new string node.
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Heredocs don't don't start a new string node when encountering "\\n".
Builds on top of #3341, but only because the tokens would otherwise not line up. It's otherwise totally standalone. Will actually fix rubocop/rubocop#12878