feat: reorganize entry points

[dai-shi]

This adds new entry points:

• valtio/vanilla/utils
• valtio/react
• valtio/react/utils

Everything is re-exported, so existing code shouldn't break.

Also, update readme.md to follow #626.

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Name	Status	Preview	Updated
valtio	✅ Ready (Inspect)	Visit Preview	Jan 15, 2023 at 6:30AM (UTC)

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Latest deployment of this branch, based on commit 910d4ec:

Sandbox	Source
React	Configuration
React Typescript	Configuration
React Browserify	Configuration
React Snowpack	Configuration
React Parcel	Configuration

[github-actions]

Size Change: +630 B (+1%)

Total Size: 55.2 kB

Filename	Size	Change
dist/esm/index.js	62 B	-684 B (-92%)	🏆
dist/esm/react-utils.js	0 B	-217 B (removed)	🏆
dist/esm/utils.js	68 B	-4.11 kB (-98%)	🏆
dist/index.js	232 B	-535 B (-70%)	🏆
dist/react-utils.js	0 B	-234 B (removed)	🏆
dist/system/index.development.js	236 B	-679 B (-74%)	🏆
dist/system/index.production.js	170 B	-353 B (-67%)	🏆
dist/system/react-utils.development.js	0 B	-942 B (removed)	🏆
dist/system/react-utils.production.js	0 B	-523 B (removed)	🏆
dist/system/utils.development.js	241 B	-4.16 kB (-95%)	🏆
dist/system/utils.production.js	176 B	-2.74 kB (-94%)	🏆
dist/umd/index.development.js	372 B	-537 B (-59%)	🏆
dist/umd/index.production.js	322 B	-302 B (-48%)	🎉
dist/umd/macro.development.js	1.05 kB	-2 B (0%)
dist/umd/macro.production.js	724 B	-3 B (0%)
dist/umd/react-utils.development.js	0 B	-895 B (removed)	🏆
dist/umd/react-utils.production.js	0 B	-576 B (removed)	🏆
dist/umd/utils.development.js	386 B	-4.27 kB (-92%)	🏆
dist/umd/utils.production.js	333 B	-2.66 kB (-89%)	🏆
dist/umd/vanilla.development.js	2.58 kB	-6 B (0%)
dist/umd/vanilla.production.js	1.52 kB	-6 B (0%)
dist/utils.js	236 B	-4.27 kB (-95%)	🏆
dist/esm/react.js	710 B	+710 B (new file)	🆕
dist/esm/react/utils.js	221 B	+221 B (new file)	🆕
dist/esm/vanilla/utils.js	4.18 kB	+4.18 kB (new file)	🆕
dist/react.js	653 B	+653 B (new file)	🆕
dist/react/utils.js	237 B	+237 B (new file)	🆕
dist/system/react.development.js	851 B	+851 B (new file)	🆕
dist/system/react.production.js	466 B	+466 B (new file)	🆕
dist/system/react/utils.development.js	316 B	+316 B (new file)	🆕
dist/system/react/utils.production.js	221 B	+221 B (new file)	🆕
dist/system/vanilla/utils.development.js	4.4 kB	+4.4 kB (new file)	🆕
dist/system/vanilla/utils.production.js	2.92 kB	+2.92 kB (new file)	🆕
dist/umd/react.development.js	797 B	+797 B (new file)	🆕
dist/umd/react.production.js	519 B	+519 B (new file)	🆕
dist/umd/react/utils.development.js	396 B	+396 B (new file)	🆕
dist/umd/react/utils.production.js	297 B	+297 B (new file)	🆕
dist/umd/vanilla/utils.development.js	4.66 kB	+4.66 kB (new file)	🆕
dist/umd/vanilla/utils.production.js	3 kB	+3 kB (new file)	🆕
dist/vanilla/utils.js	4.51 kB	+4.51 kB (new file)	🆕

ℹ️ View Unchanged

Filename	Size
dist/esm/macro.js	698 B
dist/esm/macro/vite.js	809 B
dist/esm/vanilla.js	2.27 kB
dist/macro.js	939 B
dist/macro/vite.js	1.09 kB
dist/system/macro.development.js	779 B
dist/system/macro.production.js	556 B
dist/system/macro/vite.development.js	894 B
dist/system/macro/vite.production.js	660 B
dist/system/vanilla.development.js	2.4 kB
dist/system/vanilla.production.js	1.45 kB
dist/umd/macro/vite.development.js	1.23 kB
dist/umd/macro/vite.production.js	882 B
dist/vanilla.js	2.47 kB

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