fix(hydration): provide compat fallback for idle callback

[GalacticHypernova]

This PR provides a compatibility polyfill for idle callback, which is not supported in Safari. The implementation is taken straight from Nuxt's.

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Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	101 kB (+66 B)	38.1 kB (+24 B)	34.3 kB (+22 B)
vue.global.prod.js	160 kB (+66 B)	58.1 kB (+30 B)	51.6 kB (+45 B)

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	49.2 kB (+91 B)	19 kB (+46 B)	17.3 kB (-1 B)
createApp	55.8 kB (+91 B)	21.5 kB (+46 B)	19.6 kB (+34 B)
createSSRApp	59.8 kB (+91 B)	23.2 kB (+49 B)	21.1 kB (+27 B)
defineCustomElement	60.6 kB (+91 B)	23.1 kB (+48 B)	21 kB (+38 B)
overall	69.5 kB (+91 B)	26.6 kB (+41 B)	24.2 kB (+25 B)

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commit: 3b01a2a