feat(customElement): support attachInternals method

[edison1105]

close #10948

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	101 kB (+185 B)	38 kB (+52 B)	34.2 kB (+44 B)
vue.global.prod.js	159 kB (+185 B)	58 kB (+57 B)	51.5 kB (+62 B)

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	46.9 kB	18.3 kB	16.7 kB
createApp	55 kB	21.3 kB	19.4 kB
createSSRApp	59 kB	23 kB	20.9 kB
defineCustomElement	59.9 kB (+122 B)	22.9 kB (+53 B)	20.8 kB (-28 B)
overall	68.7 kB	26.3 kB	24 kB

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commit: 580c3de

[lejunyang]

Should we also create a new API like useHostInternals()? As _internal seems to be a private field