feat: implement basic v-memo

[Jevon617]

Related: #18.

Demo

I don't know if this is the best way to implement it. So, Please give me some feedback, thanks very much!

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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	54.9 kB (+716 B)	18.7 kB (+199 B)	16.9 kB (+197 B)
runtime-dom.global.prod.js	96.5 kB	36.4 kB	32.8 kB
runtime-vapor.global.prod.js	45.9 kB (+674 B)	17.1 kB (+245 B)	15.7 kB (+272 B)
vue-vapor.global.prod.js	98 kB (+1.34 kB)	34.3 kB (+418 B)	30.9 kB (+373 B)
vue.global.prod.js	154 kB	55.8 kB	49.8 kB

Usages

Name	Size	Gzip	Brotli
createApp	56.9 kB	21.8 kB	19.9 kB
createSSRApp	60.3 kB	23.2 kB	21.2 kB
defineCustomElement	59.2 kB	22.6 kB	20.6 kB
vapor	46.3 kB (+672 B)	17.2 kB (+245 B)	15.7 kB (+211 B)
overall	70.7 kB	26.9 kB	24.3 kB

[sxzz]

The issue has been marked as on hold. We are currently not implementing v-memo.