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adds simpler Nim's AST to/from NIF #25243
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            demotomohiro
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Old Nimony has unfixed issue nim-lang/nimony#1313. So #25243 doesn't work correctly with float literal `-0.0`. This PR updates the Nimony that fixed the issue.
  
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Rewrite #25201.
This PR traverse PNode and when it get an unknown type, encode it to
(typeId <type id> <fields of PType>)and add it to a set of encoded PType.When it get the same type again, encode it to
(t <type id>)and doesn't traverse fields of the type.PSym are also encoded in the similar way.
So it can encode PNode to NIF even if there are cycles in PType.
This PR is simpler than #25201 as it doesn't contains type or statement specific code.