Shaders

[Firestar99]

Requires #2984 and a few more in other repos to be merged

Prototype for compiling nodes to shaders, currently creates a giant wgsl file. Needs quite a bit more cleanup and work in other repos as well.

From weekly updates

End of week update (week 11):

$ git checkout shaders
$ cargo b -p graphene-raster-nodes
    Finished `dev` profile [optimized + debuginfo] target(s) in 0.26s
$ ll ./target/spirv-builder/spirv-unknown-naga-wgsl/release/deps/graphene_raster_nodes.wgsl -h
-rw-r--r-- 1 firestar99 users 149K Aug  3 23:37 ./target/spirv-builder/spirv-unknown-naga-wgsl/release/deps/graphene_raster_nodes.wgsl