types: add loading prop to iframe

[chirokas]

We already had it for <img /> but forgot it for <iframe />.

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB	37.7 kB	33.9 kB
vue.global.prod.js	159 kB	57.5 kB	51.1 kB

Usages

Name	Size	Gzip	Brotli
createApp	55.1 kB	21.2 kB	19.3 kB
createSSRApp	59.1 kB	22.9 kB	20.8 kB
defineCustomElement	59.8 kB	22.7 kB	20.7 kB
overall	68.8 kB	26.3 kB	23.9 kB

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commit: d0e94c5