refactor(vapor): drop memo

[sxzz]

Closes #18

Drop v-memo in Vapor, since it's useless for performance.

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Size Report

Bundles

File	Size	Gzip	Brotli
compiler-dom.global.prod.js	81 kB	28.4 kB	25.1 kB
runtime-dom.global.prod.js	100 kB	38 kB	34.2 kB
runtime-vapor.global.prod.js	47.8 kB (-566 B)	18.1 kB (-211 B)	16.6 kB (-198 B)
vue-vapor.global.prod.js	47.8 kB (-566 B)	18.1 kB (-214 B)	16.6 kB (-177 B)
vue.global.prod.js	158 kB	57.8 kB	51.4 kB

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	47.4 kB	18.4 kB	16.8 kB
createApp	55.5 kB	21.4 kB	19.5 kB
createVaporApp	27.3 kB (-217 B)	10.4 kB (-96 B)	9.61 kB (-88 B)
createSSRApp	59.5 kB	23.1 kB	21 kB
defineCustomElement	60.3 kB	23 kB	20.9 kB
overall	69.3 kB	26.5 kB	24.1 kB