Babel preset with integrated StyleX

[necolas]

This patch changes RSD to export a babel preset (not plugin), which integrates StyleX to simplify developer setup and ensure that the correct configuration is used.

StyleX itself is also patched to fix theming on web and remove deprecated or unrelated APIs for cross-platform React.

[github-actions[bot]]

workflow: benchmarks/size

Comparison of minified (terser) and compressed (brotli) size results, measured in bytes. Smaller is better.	Results	Base	Patch	Ratio
react-strict-dom/dist/dom/index.js
· compressed	2,488	2,488	1.00
· minified	8,586	8,586	1.00
react-strict-dom/dist/dom/runtime.js
· compressed	836	850	1.02	+
· minified	2,365	2,404	1.02	+
react-strict-dom/dist/native/index.js
· compressed	15,342	15,342	1.00
· minified	57,046	57,046	1.00

[github-actions[bot]]

workflow: benchmarks/perf (native)

Comparison of performance test results, measured in operations per second. Larger is better.	Results	Base	Patch	Ratio
css.create
· small	1,141,629	1,151,403	1.01	+
· small with units	442,905	447,118	1.01	+
· small with variables	672,730	676,461	1.01	+
· several small	323,392	327,583	1.01	+
· large	211,508	212,810	1.01	+
· large with polyfills	147,841	149,513	1.01	+
· complex	101,814	102,220	1.00	+
· unsupported	222,523	224,932	1.01	+
css.createTheme
· simple theme	219,267	222,056	1.01	+
· polyfill theme	207,349	207,580	1.00	+
css.props
· small	246,318	249,397	1.01	+
· small with units	191,880	193,913	1.01	+
· small with variables	103,872	106,470	1.03	+
· small with variables of units	74,155	75,021	1.01	+
· large	105,180	106,486	1.01	+
· large with polyfills	37,053	37,623	1.02	+
· complex	23,528	23,898	1.02	+
· unsupported	147,091	149,005	1.01	+
· simple merge	164,907	166,404	1.01	+
· wide merge	17,955	18,088	1.01	+
· deep merge	17,697	17,847	1.01	+
· themed merge	32,016	32,243	1.01	+