Parse SUBSTRING
FROM
syntax in all dialects, reflect change in the AST
#1173
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always accept both substring function syntaxes in all dialects,
and ensure SUBSTRING expression are always formatted with the same syntax as the one they were parsed with.
This both simplifies the code (making it easier to maintain as databases evolve) AND creates a higher-fidelity syntax tree for dialects that support both syntaxes
fixes #1168