fix(build): use *.d.mts for esm ('import' condition only)

[dai-shi]

following pmndrs/zustand#1387

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Name	Status	Preview	Updated
valtio	✅ Ready (Inspect)	Visit Preview	Oct 26, 2022 at 10:47AM (UTC)

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Size Change: 0 B

Total Size: 51 kB

ℹ️ View Unchanged

Filename	Size
dist/esm/index.js	997 B
dist/esm/macro.js	617 B
dist/esm/macro/vite.js	732 B
dist/esm/utils.js	4.14 kB
dist/esm/vanilla.js	2.02 kB
dist/index.js	1.02 kB
dist/macro.js	896 B
dist/macro/vite.js	1.03 kB
dist/system/index.development.js	1.17 kB
dist/system/index.production.js	530 B
dist/system/macro.development.js	725 B
dist/system/macro.production.js	555 B
dist/system/macro/vite.development.js	839 B
dist/system/macro/vite.production.js	660 B
dist/system/utils.development.js	4.35 kB
dist/system/utils.production.js	2.92 kB
dist/system/vanilla.development.js	2.16 kB
dist/system/vanilla.production.js	1.35 kB
dist/umd/index.development.js	1.15 kB
dist/umd/index.production.js	636 B
dist/umd/macro.development.js	1.05 kB
dist/umd/macro.production.js	757 B
dist/umd/macro/vite.development.js	1.2 kB
dist/umd/macro/vite.production.js	882 B
dist/umd/utils.development.js	4.81 kB
dist/umd/utils.production.js	3.07 kB
dist/umd/vanilla.development.js	2.35 kB
dist/umd/vanilla.production.js	1.47 kB
dist/utils.js	4.66 kB
dist/vanilla.js	2.23 kB

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