466: add debug trait for public types r=kvark a=Andful
This pull request is to resolve the issue #458.
This pull request is still incomplete. The only problematic trait is `RenderBundleEncoder`.
For the native version, `RenderBundleEncoder` does not implement `Debug`. This would have to be implemented in the wgpu project.
FYI, Context does not need to implement `Debug`. The type that implements `Context` is used directly, i.e. `Arc<C>` is used and not `Arc<dyn Context>`
Co-authored-by: Andrea Nardi <buongiorno19972@gmail.com>