fix(types): export INTERNAL interface

[dai-shi]

#474 changed type aliases to interfaces.
I learned this can cause issues with public types. pmndrs/jotai#1261
This PR export an interface with INTERNAL_ prefix.
This should cover some edge use cases. #292 (comment)

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Size Change: +1 B (0%)

Total Size: 48.1 kB

Filename	Size	Change
dist/system/index.production.js	508 B	+1 B (0%)

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dist/esm/macro.js	613 B
dist/esm/macro/vite.js	697 B
dist/esm/utils.js	3.92 kB
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dist/index.js	880 B
dist/macro.js	910 B
dist/macro/vite.js	982 B
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dist/umd/index.production.js	670 B
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dist/umd/vanilla.development.js	2.11 kB
dist/umd/vanilla.production.js	1.32 kB
dist/utils.js	4.55 kB
dist/vanilla.js	2.01 kB

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