feat(runtime-core): export currentInstance methods

[sibbng]

Close #4611

Hi, I'm maintainer of reactivue. I rewrote it from scratch and managed to shrink it down to ~150 lines by using EffectScope API. But to support Vue plugins like pinia, @vueuse/head I needed to access setCurrentInstance method.

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[LinusBorg]

I'm not sure we feel comfortable exposing hooks into these internals.

Can you share a bit more about the use case and what problem this solves?

[crutchcorn]

@LinusBorg I actually wrote a lot about that here

#4611

That said, how about we export this under a namespace similar to how we export SSR utils?

[edison1105]

a workaround see #4611 (comment)

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	101 kB (+370 B)	38 kB (+51 B)	34.2 kB (+52 B)
vue.global.prod.js	159 kB (+370 B)	57.9 kB (+35 B)	51.5 kB (+84 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	59.8 kB	22.8 kB	20.8 kB
overall	68.7 kB	26.3 kB	24 kB

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commit: 62a9af5

[geferon]

Would be nice to have these methods expose for other libraries to use...