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refactor(builtin): generalize ReadOnlyArray::join to ToStringView

Array::join and ArrayView::join already accept any `[A : ToStringView]`
element type, but ReadOnlyArray::join was restricted to
`ReadOnlyArray[String]`. Widen it to match by routing through
ArrayView::join via `self[:]`, and add a test covering the StringView
element case.

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

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