message: Use fmt for pointer -> varchar conversion, and correctly use StringVector::AddString
diff: @@ -1281,7 +1281,8 @@ string_t CastFromBlob::Operation(string_t input, Vector &vector) {
  //===--------------------------------------------------------------------===//
  template <>
  string_t CastFromPointer::Operation(uintptr_t input, Vector &vector) {
  - return string_t(std::to_string(input));
  + std::string s = duckdb_fmt::format("0x{:x}", input);
  + return StringVector::AddString(vector, s);
  }
  //===--------------------------------------------------------------------===//
  