moonbitlang / core / 1434

Pull #2800

github

feat: separate Iterator into dedicated iterator package

- Create new iterator package with external Iterator[A] implementation
- Move Iterator struct and all methods (next, map, filter, fold, etc.) to iterator package
- Add Iterator factory methods: empty(), singleton(), unfold()
- Add AsyncIterator[A] implementation for async iteration
- Update list package to depend on iterator package
- Add List::into_iterator() method for converting List to Iterator
- Add into_async_iterator() method for converting List to AsyncIterator
- Add collect_from_iterator() function for collecting Iterator back to List
- Maintain all existing functionality with 5646 tests passing
- Avoid circular dependencies by keeping iterator package minimal
- Add comprehensive tests and documentation for iterator package

Breaking change: Iterator is now in @iterator package instead of @list

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