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 (+72 B)	37.9 kB (+47 B)	34.1 kB (+9 B)
vue.global.prod.js	159 kB (+72 B)	57.8 kB (+30 B)	51.3 kB (+2 B)

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	48.9 kB (+102 B)	18.9 kB (+52 B)	17.2 kB (-17 B)
createApp	55.5 kB (+102 B)	21.4 kB (+59 B)	19.5 kB (+52 B)
createSSRApp	59.5 kB (+102 B)	23.1 kB (+57 B)	21 kB (+68 B)
defineCustomElement	60.3 kB (+102 B)	22.9 kB (+61 B)	20.9 kB (+55 B)
overall	69.2 kB (+102 B)	26.4 kB (+45 B)	24 kB (+50 B)

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commit: 8d28ac7

[yyx990803]

Move this into the functions where it's needed and call it inline (it's cached) so that this can be treeshaken with the functions

[GalacticHypernova]

Typescript appears to have issues with this approach