feat(customElement): support for expose on customElement, fix #5540

[hcg1023]

fix #5540

[itwondersteam]

any sign that this PR will get updated and get merged? bumped into this issue today as the defineExpose currently is not behaves consistently.

[GuoJikun]

This feature is much needed

[Ttou]

hope merged quickly

[amantiwari1]

This pull request needs to be merged promptly, and it has been open for one year and three months. cc: @yyx990803

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[hcg1023]

I fixed the conflict on the branch

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	97.3 kB (+7.2 kB)	37 kB (+2.41 kB)	33.3 kB (+2.13 kB)
vue.global.prod.js	155 kB (+8.16 kB)	56.7 kB (+2.7 kB)	50.5 kB (+2.43 kB)

Usages

Name	Size	Gzip	Brotli
createApp	53.8 kB (+4.19 kB)	20.9 kB (+1.38 kB)	19 kB (+1.21 kB)
createSSRApp	57.8 kB (+4.57 kB)	22.5 kB (+1.52 kB)	20.4 kB (+1.34 kB)
defineCustomElement	57.2 kB (+5.26 kB)	22 kB (+1.73 kB)	20 kB (+1.52 kB)
overall	67.4 kB (+4.25 kB)	25.9 kB (+1.39 kB)	23.5 kB (+1.25 kB)