feat: implement setRef update

[Doctor-wu]

• runtime
• test case

close #190

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Size Report

Bundles

File	Size	Gzip	Brotli
compiler-dom.global.prod.js	80.1 kB	28.2 kB	24.7 kB
compiler-vapor.global.prod.js	52.6 kB (+246 B)	18 kB (+90 B)	16.3 kB (+54 B)
runtime-dom.global.prod.js	94.7 kB	35.6 kB	32.2 kB
runtime-vapor.global.prod.js	45 kB (+87 B)	16.8 kB (+38 B)	15.4 kB (+29 B)
vue-vapor.global.prod.js	95 kB (+293 B)	33.3 kB (+111 B)	30.1 kB (+125 B)
vue.global.prod.js	152 kB	55 kB	49.1 kB

Usages

Name	Size	Gzip	Brotli
createApp	54.8 kB	21.1 kB	19.2 kB
createSSRApp	58.1 kB	22.4 kB	20.4 kB
defineCustomElement	57.1 kB	21.8 kB	19.8 kB
vapor	45.2 kB (+87 B)	16.8 kB (+37 B)	15.4 kB (+36 B)
overall	68.5 kB	26.1 kB	23.7 kB

[sxzz]

Refactored a bit. We can omit the latest undefined param.

[sxzz]

Good job!