refactor(vanilla): simplify store impl (v2 API)

[dai-shi]

follow up #1611.
I forgot something is no longer used, so removed.

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Name	Status	Preview	Updated
jotai	✅ Ready (Inspect)	Visit Preview	Dec 8, 2022 at 0:03AM (UTC)

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Size Change: -99 B (0%)

Total Size: 201 kB

Filename	Size	Change
dist/esm/vanilla.js	2.81 kB	-17 B (-1%)
dist/system/vanilla.development.js	2.9 kB	-17 B (-1%)
dist/system/vanilla.production.js	1.63 kB	-6 B (0%)
dist/umd/vanilla.development.js	3.82 kB	-24 B (-1%)
dist/umd/vanilla.production.js	2.24 kB	-11 B (0%)
dist/vanilla.js	3.73 kB	-24 B (-1%)

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Filename	Size
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dist/babel/plugin-react-refresh.js	1.11 kB
dist/babel/preset.js	1.35 kB
dist/devtools.js	3.79 kB
dist/esm/babel/plugin-debug-label.js	869 B
dist/esm/babel/plugin-react-refresh.js	1.05 kB
dist/esm/babel/preset.js	1.32 kB
dist/esm/devtools.js	2.97 kB
dist/esm/immer.js	77 B
dist/esm/index.js	5.2 kB
dist/esm/optics.js	60 B
dist/esm/query.js	442 B
dist/esm/react.js	965 B
dist/esm/react/devtools.js	2.46 kB
dist/esm/react/utils.js	574 B
dist/esm/redux.js	65 B
dist/esm/urql.js	776 B
dist/esm/utils.js	5.26 kB
dist/esm/valtio.js	66 B
dist/esm/vanilla/utils.js	3.89 kB
dist/esm/xstate.js	77 B
dist/esm/zustand.js	67 B
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dist/optics.js	159 B
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dist/react/utils.js	1.25 kB
dist/redux.js	161 B
dist/system/babel/plugin-debug-label.development.js	970 B
dist/system/babel/plugin-debug-label.production.js	728 B
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dist/system/babel/plugin-react-refresh.production.js	899 B
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dist/system/immer.production.js	150 B
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dist/system/react/devtools.production.js	1.83 kB
dist/system/react/utils.development.js	720 B
dist/system/react/utils.production.js	451 B
dist/system/redux.development.js	167 B
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dist/umd/devtools.production.js	2.6 kB
dist/umd/immer.development.js	329 B
dist/umd/immer.production.js	275 B
dist/umd/index.development.js	6.25 kB
dist/umd/index.production.js	3.47 kB
dist/umd/optics.development.js	300 B
dist/umd/optics.production.js	249 B
dist/umd/query.development.js	838 B
dist/umd/query.production.js	585 B
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dist/umd/redux.production.js	252 B
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dist/umd/valtio.development.js	303 B
dist/umd/valtio.production.js	252 B
dist/umd/vanilla/utils.development.js	4.84 kB
dist/umd/vanilla/utils.production.js	3.04 kB
dist/umd/xstate.development.js	327 B
dist/umd/xstate.production.js	273 B
dist/umd/zustand.development.js	306 B
dist/umd/zustand.production.js	253 B
dist/urql.js	4.46 kB
dist/utils.js	9.68 kB
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dist/vanilla/utils.js	4.68 kB
dist/xstate.js	184 B
dist/zustand.js	164 B

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