feat(effectScope): add onDispose method

[Alfred-Skyblue]

When the effectScope is not active, we can only listen to its dispose in the following way:

const scope = effectScope();

scope.run(() => {});

scope.cleanups.push(() => {
  /* code */
});

Although this method solves the current problem, it is rather cumbersome. In this PR, I have added an onDispose method, allowing us to listen to the dispose of effectScope in the following manner:

const scope = effectScope();

scope.run(() => {});

scope.onDispose(() => {
  /* code */
});

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	99 kB (+31 B)	37.5 kB (+12 B)	33.8 kB (+33 B)
vue.global.prod.js	157 kB (+31 B)	57.3 kB (+12 B)	50.9 kB (-60 B)

Usages

Name	Size	Gzip	Brotli
createApp	54.2 kB (+35 B)	21 kB (+14 B)	19.2 kB (+18 B)
createSSRApp	58.2 kB (+35 B)	22.6 kB (+16 B)	20.6 kB (+17 B)
defineCustomElement	58.8 kB (+35 B)	22.5 kB (+14 B)	20.5 kB (+64 B)
overall	67.8 kB (+35 B)	26 kB (+14 B)	23.7 kB (+60 B)

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