Make YaccGrammarErrorKind and LexErrorKind non_exhaustive.
#501
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This adds the
non_exhaustiveattribute to the*ErrorKindenums.It appears they are being used exhaustively everywhere because adding it didn't require any other code changes outside of their respective crates.
This is technically a breaking change that seems unlikely to break anything, but should allow us to add
ErrorKindvariants in the future without risk.