refactor: component slots

[sxzz]

/cc @Doctor-wu @LittleSound

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[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
compiler-dom.global.prod.js	81.2 kB	28.5 kB	25.1 kB
compiler-vapor.global.prod.js	57.6 kB (-47 B)	19.6 kB (+6 B)	17.7 kB (-25 B)
runtime-dom.global.prod.js	95.4 kB	36 kB	32.4 kB
runtime-vapor.global.prod.js	48.9 kB (+51 B)	18.2 kB (-9 B)	16.7 kB
vue-vapor.global.prod.js	104 kB (-15 B)	36.3 kB (+2 B)	32.7 kB (+20 B)
vue.global.prod.js	154 kB	55.6 kB	49.7 kB

Usages

Name	Size	Gzip	Brotli
createApp	55.8 kB	21.4 kB	19.5 kB
createSSRApp	59.1 kB	22.7 kB	20.7 kB
defineCustomElement	58.1 kB	22.1 kB	20.1 kB
vapor	49.3 kB (+51 B)	18.3 kB (+16 B)	16.7 kB (-14 B)
overall	69.6 kB	26.4 kB	23.9 kB

[Doctor-wu]

fixed some issues, help cc @sxzz @LittleSound