Feature to generate bindings for bevy

[Swoorup]

wgsl-bindgen is able to currently generate extra bind group layout entries that can be customized to user's liking which is possibly different to that of Wgpu api.

See https://github.com/Swoorup/wgsl-bindgen/blob/main/wgsl_bindgen/src/bindgen/options/bindings.rs

Would be nice to get this to a stage where everything can be customized and target framework can be specified by the user, for eg: bevy?