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feat(builtin): add ReadOnlyArray::chunks and windows

Array and ArrayView both expose `chunks` (non-overlapping slices of a
fixed size) and `windows` (all overlapping sub-views of a fixed size).
ReadOnlyArray didn't. Add both, returning `Array[ArrayView[T]]` to
match the sibling signatures exactly; the views themselves are
read-only (ArrayView has no `set` operator).

Implementations route through ArrayView via `self[:]`. Tests cover
exact-multiple chunks, the trailing short chunk, an empty input,
exact-fit windows, and size-larger-than-length.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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