types(effect): pass type argument to return type in effect

[CyanSalt]

The return value of the effect function currently has an overly loose type (any). Refer to the following example:

And

In this example, effect accepts an fn which will return a Promise<void>, and since the return value of effect is actually the return value of ReactiveEffect#run, which is the return value of fn. So effect should also return a Promise<void>. However, due to the lack of type argument passing, the type is currently derived as any.

After this PR change it looks like this

And

And

[skirtles-code]

Similar to #6024.

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	86.5 kB	32.9 kB	29.7 kB
vue.global.prod.js	132 kB	49.6 kB	44.5 kB

Usages

Name	Size	Gzip	Brotli
createApp	47.9 kB	18.9 kB	17.2 kB
createSSRApp	51.2 kB	20.2 kB	18.4 kB
defineCustomElement	50.3 kB	19.7 kB	17.9 kB
overall	61.3 kB	23.7 kB	21.6 kB

[yyx990803]

Thanks for the PR and sorry for letting it sit.

In the current minor branch for 3.5, the reactivity system got refactored and the generic argument is already passed to ReactiveEffectRunner, so I'm closing this to avoid future conflicts.