Introduce shader examples that don't use high level rendering apis

# Objective

Most of the shader examples use the `Material` trait and the few remaining ones that don't use it might be updated in the future to either use that or some other high level rendering api.

We need an example that showcases a manual implementation for drawing a basic mesh without any high level apis.

There should also be an example showcasing a manual implementation of `AsBindGroup`.

These examples should be clearly used to showcase those lower level features and not be updated to higher level apis in the future.

# Notes

Discord dicussion: https://discord.com/channels/691052431525675048/743663924229963868/1014539753854615662