fix(types): use TS interfaces only for public api

[dai-shi]

following pmndrs/zustand#1106

This reverts #1234 to some extent.
Exporting types is revisited. For example, AtomFamily is exported now. #1012

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Size Change: +1 B (0%)

Total Size: 142 kB

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dist/system/index.production.js	2.92 kB	+1 B (0%)

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