Add example: Image Blur

[wonkyDD]

If it's okay with you,

I'd like to contribute example
by porting an Image Blur example
into react-native-wgpu version.

[wcandillon]

of course any new examples are more than welcome

[huytdps13400]

I opened #452 with a React Native port of the official WebGPU image-blur sample. It includes interactive kernel/pass controls, event-driven rendering, explicit GPU resource cleanup, dispatch-plan regression tests, a passing Node WebGPU blur render test, full monorepo TypeScript, and a successful Metro iOS bundle.