Add babel plugin to optimize web output

[necolas]

The babel plugin can be used to optimize web builds.

• Removes the React component wrapper and its associated runtime performance overhead.
• Reduces the compressed bundle size of the runtime from 2.9 KB to 0.9KB. This brings the combined runtime size of RSD and StyleX on web to about 2 KB.

Fix #23

[github-actions]

compressed-size: runtime library

Size change: +0.97 kB
Total size: 15.89 kB

Filename: gzip (minify)	kB size	kB change	% change
./packages/react-strict-dom/dist/dom.js	2.89 (8.62)	+0.05 (-0.20)	+1.9% (-2.2%)	🔴
./packages/react-strict-dom/dist/runtime.js	0.92 (2.26)	+0.92 (+2.26)	+100.0% (+100.0%)	🔴

View unchanged

Filename: gzip (minify)	kB size	kB change	% change
./packages/react-strict-dom/dist/native.js	12.08 (37.83)	0.00 (0.00)	0.0% (0.0%)

[nmn]

Found some nits but they're edge-cases that can be fixed later.

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But I wonder if it would better to make this a separate package?