mark SuspenseListContext as PURE to allow treeshaking

[titoBouzout]

Doing export { className } from "solid-js@1.8/web"; exports the whole unused reactive utils, seems to me the createContext call for SuspenseListContext is causing the issue.

references:
https://x.com/jlarky/status/1806908281618890951
https://bundlejs.com/?q=solid-js%401.8%2Fweb&treeshake=%5B%7B+className+%7D%5D&config=%7B%22esbuild%22%3A%7B%22minify%22%3Afalse%7D%7D
https://esbuild.github.io/api/#tree-shaking

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I haven't test this change

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[coveralls]

Pull Request Test Coverage Report for Build 9732385258

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 93.56%

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Totals
Change from base Build 9716994460:	0.0%
Covered Lines:	4186
Relevant Lines:	4408

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💛 - Coveralls