fix: mark open-props type as module for ESM compat

[nmn]

Fixes #505

Marks the @stylexjs/open-props package as an ESM package.

[github-actions]

compressed-size: runtime library

Size change: 0.00 kB
Total size: 2.52 kB

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Filename: gzip (minify)	kB size	kB change	% change
./packages/stylex/lib/stylex.js	1.04 (3.22)	0.00 (0.00)	0.0% (0.0%)
./packages/stylex/lib/StyleXSheet.js	1.48 (3.75)	0.00 (0.00)	0.0% (0.0%)

[github-actions]

compressed-size: e2e bundles

Size change: 0.00 kB
Total size: 1128.74 kB

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Filename: gzip (minify)	kB size	kB change	% change
./apps/rollup-example/.build/bundle.js	1005.32 (10185.35)	0.00 (0.00)	0.0% (0.0%)
./apps/rollup-example/.build/stylex.css	123.42 (774.34)	0.00 (0.00)	0.0% (0.0%)

[eryue0220]

Sorry, I didn't notice this PR before. I committed a related pr, but the solution is different with this one. I think this will affect those non esm modules.

[nmn]

@eryue0220 I saw your PR as well. I've been thinking about it and I don't think the extra work you did is needed. Since open-props needs to be compiled when used, it's not necessary to make CJS packages available at all.

[eryue0220]

@nmn Sorry for the late response. I thought you are right, and I've closed my pr. Thank you for your answer.