Standalone examples for re_renderer

To get a list of all examples run:

cargo run -p re_renderer_examples --bin

E.g. to run the `multiview`` example run

cargo run -p re_renderer_examples --bin multiview

To run the same example on the web:

cargo run-wasm -p re_renderer_examples --bin multiview

Note that this will try to use WebGPU and fall back to WebGL if WebGPU is not supported by your browser.