Fix: Validate options passed into the Babel plugin

[nmn]

What changed / motivation ?

Improve the Babel plugin's StateManager to not use $FlowFixMe (any) and instead of validate the options passed in.

The code is very imperative at the moment and feels a bit hard to read and fragile. I'm looking into using a library like zod to clean this up.

[github-actions[bot]]

compressed-size: runtime library

Size change: 0.00 kB Total size: 2.43 kB

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Filename: gzip (minify)	kB size	kB change	% change
./packages/stylex/lib/stylex.js	0.95 (3.31)	0.00 (0.00)	0.0% (0.0%)
./packages/stylex/lib/StyleXSheet.js	1.48 (3.75)	0.00 (0.00)	0.0% (0.0%)

[github-actions[bot]]

compressed-size: e2e bundles

Size change: 0.00 kB Total size: 1128.38 kB

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Filename: gzip (minify)	kB size	kB change	% change
./apps/rollup-example/.build/bundle.js	1005.18 (10185.36)	0.00 (0.00)	0.0% (0.0%)
./apps/rollup-example/.build/stylex.css	123.20 (772.94)	0.00 (0.00)	0.0% (0.0%)