feat(compile-dom): stringify mathML

[edison1105]

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Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB	37.7 kB	34 kB
vue.global.prod.js	159 kB	57.6 kB	51.3 kB

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	48.8 kB	18.8 kB	17.2 kB
createApp	55.3 kB	21.2 kB	19.4 kB
createSSRApp	59.3 kB	22.9 kB	20.9 kB
defineCustomElement	60 kB	22.8 kB	20.7 kB
overall	69 kB	26.3 kB	23.9 kB

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commit: e92e558

[yyx990803]

Merging as a fix since previously MathML can be considered unintended de-optimization.