fix(openapi-typescript): correct generated type when using `prefixItems`

[zyoshoka]

Changes

Closes #1892

How to Review

Note that this PR also adds support for unevaluatedItems, which was supported in OAS 3.1.0.

Checklist

• [x] Unit tests updated
• [x] docs/ updated (if necessary)
• [x] pnpm run update:examples run (only applicable for openapi-typescript)

[changeset-bot[bot]]

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Latest commit: 909f2147d63769cc657d716ef7a68fb6787f8b88

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[duncanbeevers]

Part of this PR is superseded by https://github.com/openapi-ts/openapi-typescript/pull/2148 I did not include support for unevaluatedItems, so this PR is likely worth revisiting once that work lands in order to add that support.