[example] Add shaders_rounded_rectangle example (#4719)

* Add shaders_rounded_rectangle example

* Minor tweaks to example template (add star, more)

* Combine shaders

* Fix changes after review

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Co-authored-by: Anstro Pleuton <anstropleuton@github.com>
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Anstro Pleuton 2025-01-23 01:51:36 -08:00 • committed by GitHub
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