Add parseraw function #1
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What actually needs to happen here is quite different. I'll take a crack at that later
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We at Lyft are using this library to lint and perform operations on the AST of metricsql queries. This means we are roundtripping the queries from a source and back. For our usecase, we'd prefer to have a way to operate directly on the unoptimized parse tree. As an example, there are times where doing constant folding would write back a query that is less useful to a human.
To enable this use case, I've pulled out the core functionality of calling parseInternal, and evaluating the WITH expressions into a separate function.