Reorg tests and package entries

[necolas]

• Minor reorganization of stray unit tests
• Reorganize babel code and tests
• Use Node.js package exports

[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	836	1.00
· minified	2,365	2,365	1.00
react-strict-dom/dist/native/index.js
· compressed	15,378	15,378	1.00
· minified	57,172	57,172	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	1,092,602	1,160,809	1.06	!!
· small with units	445,051	451,424	1.01	+
· small with variables	679,631	690,816	1.02	+
· several small	319,873	331,104	1.04	+
· large	214,477	214,548	1.00	+
· large with polyfills	149,546	150,164	1.00	+
· complex	102,086	103,334	1.01	+
· unsupported	224,408	228,529	1.02	+
css.createTheme
· simple theme	221,962	220,300	0.99	-
· polyfill theme	208,189	208,523	1.00	+
css.props
· small	241,293	243,793	1.01	+
· small with units	186,485	190,842	1.02	+
· small with variables	105,473	104,484	0.99	-
· small with variables of units	72,649	74,104	1.02	+
· large	103,061	104,605	1.01	+
· large with polyfills	26,070	26,271	1.01	+
· complex	18,212	18,297	1.00	+
· unsupported	75,652	76,852	1.02	+
· simple merge	160,574	164,561	1.02	+
· wide merge	13,962	13,946	1.00	-
· deep merge	13,794	13,682	0.99	-
· themed merge	31,867	31,749	1.00	-