Parser: introduce seq![1;2;3] for sequence literals
#3390
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The parser does not do the desugaring anymore and just puts out ListLiteral or SeqLiteral nodes. Resugaring tries to reconstruct them. The pretty-printing (ToDocument) does not try to do anything fancy and just prints them as literals if that's what it got as input.
This was referenced Aug 21, 2024
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This introduces some syntax for literal sequences. I want to rework this a bit still to obtain resugaring, but posting for comments.