feat: dev-runtime returns the API instead of patching it

[nmn]

Update the dev-runtime to return the API instead of relying on patching

This is a fairly simple change that should make it easier to try out StyleX using the dev-runtime package.

Previously, it relied on using a secret __monkney__patch api within Stylex to monkey patch the @stylexjs/stylex package itself. This had many issues, but mainly

• it would sometimes patch a package that was never loaded in the browser
• it was difficult to ensure the patching happened before the API was used.

The new solution is that the default export from dev-runtime will be a function that when called with the suitable config, return the StyleX API.

Again, this is only for quick prototyping and testing out the StyleX API. It should never be used in production.

Next step

Update documentation

[github-actions]

workflow: benchmarks/size

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

@stylexjs/scripts@0.8.0 size:compare
./size-compare.js /tmp/tmp.jrNnmBpmXO /tmp/tmp.SBQeGMcUS7

Results	Base	Patch	Ratio
stylex/lib/stylex.js
· compressed	899	729	0.81	!!
· minified	3,223	2,541	0.79	!!
stylex/lib/StyleXSheet.js
· compressed	1,266	1,266	1.00
· minified	3,776	3,776	1.00
rollup-example/.build/bundle.js
· compressed	563,025	563,025	1.00
· minified	10,185,368	10,185,368	1.00
rollup-example/.build/stylex.css
· compressed	99,154	99,154	1.00
· minified	745,649	745,649	1.00