[v2] breaking: remove deprecated features

[dai-shi]

for #810

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Name	Status	Preview	Comments	Updated (UTC)
valtio	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 13, 2023 1:46pm

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Latest deployment of this branch, based on commit ec5f2999816a061684c09450b8aed7a9301ca79d:

Sandbox	Source
React	Configuration
React TypeScript	Configuration
React Browserify	Configuration
React Snowpack	Configuration
React Parcel	Configuration

[github-actions[bot]]

Size Change: -10.7 kB (-25%) 🎉

Total Size: 31.7 kB

Filename	Size	Change
dist/macro.js	0 B	-919 B (removed)	🏆
dist/macro/vite.js	0 B	-1.08 kB (removed)	🏆
dist/system/macro.development.js	0 B	-779 B (removed)	🏆
dist/system/macro.production.js	0 B	-556 B (removed)	🏆
dist/system/macro/vite.development.js	0 B	-951 B (removed)	🏆
dist/system/macro/vite.production.js	0 B	-660 B (removed)	🏆
dist/system/vanilla/utils.development.js	2.85 kB	-472 B (-14%)	👏
dist/system/vanilla/utils.production.js	1.94 kB	-266 B (-12%)	👏
dist/umd/macro.development.js	0 B	-1.03 kB (removed)	🏆
dist/umd/macro.production.js	0 B	-721 B (removed)	🏆
dist/umd/macro/vite.development.js	0 B	-1.23 kB (removed)	🏆
dist/umd/macro/vite.production.js	0 B	-879 B (removed)	🏆
dist/umd/vanilla/utils.development.js	3.44 kB	-464 B (-12%)	👏
dist/umd/vanilla/utils.production.js	2.23 kB	-250 B (-10%)	👏
dist/vanilla/utils.js	3.28 kB	-467 B (-12%)	👏

ℹ️ View Unchanged

| Filename | Size | | :--- | :---: | | `dist/index.js` | 243 B | | `dist/react.js` | 626 B | | `dist/react/utils.js` | 244 B | | `dist/system/index.development.js` | 236 B | | `dist/system/index.production.js` | 170 B | | `dist/system/react.development.js` | 815 B | | `dist/system/react.production.js` | 426 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/system/vanilla.development.js` | 2.46 kB | | `dist/system/vanilla.production.js` | 1.42 kB | | `dist/umd/index.development.js` | 382 B | | `dist/umd/index.production.js` | 330 B | | `dist/umd/react.development.js` | 763 B | | `dist/umd/react.production.js` | 490 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/umd/vanilla.development.js` | 2.62 kB | | `dist/umd/vanilla.production.js` | 1.53 kB | | `dist/utils.js` | 247 B | | `dist/vanilla.js` | 2.5 kB |

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