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This PR adds start and end positions to tokens. It'll enable the parser to know the exact structure of a graphql document.
On the way to the implementation the token lexer got refactored to simplify the code and have less moving parts around. The lexer does no longer emit tokens with byte slices but will just return a reference to the start and end in the input byte slice. This does not only simplify the lexer codebase but also improves performance by ~10% which isn't too bad.
For Usability reasons a ByteSlice lookup method has been added to both, the parser and lexer which lets the user easily transform a ByteSliceReference to a ByteSlice in case the latter is needed.