[v2] breaking: do not copy initial objects

[dai-shi]

The second step for #810

This exposes deepClone from valtio/utils. It will be used in migration docs.

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Name	Status	Preview	Comments	Updated (UTC)
valtio	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 13, 2023 1:38am

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[github-actions]

Size Change: +132 B (0%)

Total Size: 50.6 kB

Filename	Size	Change
dist/esm/vanilla.js	2.32 kB	-5 B (0%)
dist/esm/vanilla/utils.js	3.1 kB	+32 B (+1%)
dist/system/vanilla.development.js	2.46 kB	-10 B (0%)
dist/system/vanilla.production.js	1.42 kB	-13 B (-1%)
dist/system/vanilla/utils.development.js	3.32 kB	+41 B (+1%)
dist/system/vanilla/utils.production.js	2.2 kB	+17 B (+1%)
dist/umd/vanilla.development.js	2.62 kB	-8 B (0%)
dist/umd/vanilla.production.js	1.53 kB	-22 B (-1%)
dist/umd/vanilla/utils.development.js	3.91 kB	+45 B (+1%)
dist/umd/vanilla/utils.production.js	2.48 kB	+20 B (+1%)
dist/vanilla.js	2.5 kB	-8 B (0%)
dist/vanilla/utils.js	3.75 kB	+43 B (+1%)

ℹ️ View Unchanged

Filename	Size
dist/esm/index.js	62 B
dist/esm/macro.js	698 B
dist/esm/macro/vite.js	864 B
dist/esm/react.js	715 B
dist/esm/react/utils.js	225 B
dist/esm/utils.js	68 B
dist/index.js	243 B
dist/macro.js	919 B
dist/macro/vite.js	1.08 kB
dist/react.js	657 B
dist/react/utils.js	244 B
dist/system/index.development.js	236 B
dist/system/index.production.js	170 B
dist/system/macro.development.js	779 B
dist/system/macro.production.js	556 B
dist/system/macro/vite.development.js	951 B
dist/system/macro/vite.production.js	660 B
dist/system/react.development.js	851 B
dist/system/react.production.js	459 B
dist/system/react/utils.development.js	321 B
dist/system/react/utils.production.js	223 B
dist/system/utils.development.js	241 B
dist/system/utils.production.js	176 B
dist/umd/index.development.js	382 B
dist/umd/index.production.js	330 B
dist/umd/macro.development.js	1.03 kB
dist/umd/macro.production.js	721 B
dist/umd/macro/vite.development.js	1.23 kB
dist/umd/macro/vite.production.js	879 B
dist/umd/react.development.js	801 B
dist/umd/react.production.js	520 B
dist/umd/react/utils.development.js	400 B
dist/umd/react/utils.production.js	299 B
dist/umd/utils.development.js	398 B
dist/umd/utils.production.js	344 B
dist/utils.js	247 B

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