fix(core): useDebugValue in useStore

[dai-shi]

https://twitter.com/dai_shi/status/1454938054276239364

Well, it's basically adding one line.

[codesandbox-ci]

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[github-actions]

Size Change: +58 B (+1%)

Total Size: 10.7 kB

Filename	Size	Change
dist/esm/index.js	1.23 kB	+31 B (+3%)
dist/index.js	1.35 kB	+27 B (+2%)

ℹ️ View Unchanged

Filename	Size
dist/context.js	622 B
dist/esm/context.js	521 B
dist/esm/middleware.js	2.49 kB
dist/esm/shallow.js	272 B
dist/esm/vanilla.js	520 B
dist/middleware.js	2.73 kB
dist/shallow.js	318 B
dist/vanilla.js	630 B

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