feat: add `stringbool` action #2326

Job	Run time
Run Vitest in codemod/zod-to-valibot	26s
Install packages	24s
Publish library via pkg.pr.new	25s
Run Prettier in library	38s
Run ESLint in library	56s
Run Vitest in library	45s
Run Prettier in packages/to-json-schema	22s
Run ESLint in packages/to-json-schema	36s
Run Prettier in website	45s
Run Vitest in packages/to-json-schema	29s
Run ESLint in website	30s
	6m 16s

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