feat(build): use __DEV__ to control development mode

[dai-shi]

following pmndrs/jotai#968

[codesandbox-ci]

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Latest deployment of this branch, based on commit b10fb72:

Sandbox	Source
React	Configuration
React Typescript	Configuration
React Browserify	Configuration
React Snowpack	Configuration
React Parcel	Configuration
Next.js	Configuration

[github-actions]

Size Change: +9.5 kB (+36%) 🚨

Total Size: 36.1 kB

Filename	Size	Change
dist/esm/middleware.js	3.55 kB	+3 B (0%)
dist/middleware.js	3.65 kB	+1 B (0%)
dist/system/context.js	0 B	-639 B (removed)	🏆
dist/system/index.js	0 B	-1.37 kB (removed)	🏆
dist/system/middleware.js	0 B	-3.69 kB (removed)	🏆
dist/system/shallow.js	0 B	-338 B (removed)	🏆
dist/system/vanilla.js	0 B	-609 B (removed)	🏆
dist/umd/context.js	0 B	-763 B (removed)	🏆
dist/umd/index.js	0 B	-1.49 kB (removed)	🏆
dist/umd/middleware.js	0 B	-3.79 kB (removed)	🏆
dist/umd/shallow.js	0 B	-444 B (removed)	🏆
dist/umd/vanilla.js	0 B	-769 B (removed)	🏆
dist/system/context.development.js	639 B	+639 B (new file)	🆕
dist/system/context.production.js	456 B	+456 B (new file)	🆕
dist/system/index.development.js	1.37 kB	+1.37 kB (new file)	🆕
dist/system/index.production.js	888 B	+888 B (new file)	🆕
dist/system/middleware.development.js	3.67 kB	+3.67 kB (new file)	🆕
dist/system/middleware.production.js	2.61 kB	+2.61 kB (new file)	🆕
dist/system/shallow.development.js	338 B	+338 B (new file)	🆕
dist/system/shallow.production.js	253 B	+253 B (new file)	🆕
dist/system/vanilla.development.js	609 B	+609 B (new file)	🆕
dist/system/vanilla.production.js	381 B	+381 B (new file)	🆕
dist/umd/context.development.js	763 B	+763 B (new file)	🆕
dist/umd/context.production.js	559 B	+559 B (new file)	🆕
dist/umd/index.development.js	1.49 kB	+1.49 kB (new file)	🆕
dist/umd/index.production.js	967 B	+967 B (new file)	🆕
dist/umd/middleware.development.js	3.76 kB	+3.76 kB (new file)	🆕
dist/umd/middleware.production.js	2.59 kB	+2.59 kB (new file)	🆕
dist/umd/shallow.development.js	447 B	+447 B (new file)	🆕
dist/umd/shallow.production.js	344 B	+344 B (new file)	🆕
dist/umd/vanilla.development.js	775 B	+775 B (new file)	🆕
dist/umd/vanilla.production.js	497 B	+497 B (new file)	🆕

ℹ️ View Unchanged

Filename	Size
dist/context.js	622 B
dist/esm/context.js	521 B
dist/esm/index.js	1.24 kB
dist/esm/shallow.js	272 B
dist/esm/vanilla.js	536 B
dist/index.js	1.35 kB
dist/shallow.js	318 B
dist/vanilla.js	634 B

_{compressed-size-action}