Enhance stylex.props to precompile more often

[nmn]

What changed / motivation ?

stylex.props should be able to precompile to a static string or a simple expression that chooses from pre-compiled strings and skip runtime merging of classNames when all styles are defined and available statically in the same file.

Today, this is limited to direct usages only.

This PR expands that to be able to pre-compile simple expressions and constants as well, but still, intentionally bail in the case of all imports.

This should improve overall performance when StyleX styles are being used entirely locally without any cross-file style composition.

[github-actions]

workflow: benchmarks/perf

Comparison of performance test results, measured in operations per second. Larger is better.

[email protected] compare
node ./compare.js /tmp/tmp.bfJTQYazDc /tmp/tmp.0sZLBZCArB

Results	Base	Patch	Ratio
babel-plugin: stylex.create
· basic create	634	644	1.02	+
· complex create	202	202	1.00
babel-plugin: stylex.createTheme
· basic themes	467	461	0.99	-
· complex themes	43	43	1.00

[github-actions]

workflow: benchmarks/size

Comparison of minified (terser) and compressed (brotli) size results, measured in bytes. Smaller is better.

[email protected] compare
node ./compare.js /tmp/tmp.3570HFI5Xi /tmp/tmp.Q0E7aH2T6B

Results	Base	Patch	Ratio
@stylexjs/stylex/lib/cjs/stylex.js
· compressed	1,278	1,278	1.00
· minified	3,986	3,986	1.00
@stylexjs/stylex/lib/cjs/inject.js
· compressed	1,223	1,223	1.00
· minified	3,216	3,216	1.00
benchmarks/size/.build/bundle.js
· compressed	496,650	496,650	1.00
· minified	4,847,840	4,847,840	1.00
benchmarks/size/.build/stylex.css
· compressed	99,853	99,853	1.00
· minified	747,541	747,541	1.00

[mellyeliu]

@nmn looks like there's still a few failures. will get you a repro soon

[mellyeliu]

will attempt a resync soon