Restructure GPU execution to model GPU pipelines in the node graph (#1088)

* Start implementing GpuExecutor for wgpu

* Implement read_output_buffer function

* Implement extraction node in the compiler

* Generate type annotations during shader compilation

* Start adding node wrapprs for graph execution api

* Wrap more of the api in nodes

* Restructure Pipeline to accept arbitrary shader inputs

* Adapt nodes to new trait definitions

* Start implementing gpu-compiler trait

* Adapt shader generation

* Hardstuck on pointer casts

* Pass nodes as references in gpu code to avoid zsts

* Update gcore to compile on the gpu

* Fix color doc tests

* Impl Node for node refs

node-graph/gpu-compiler/gpu-compiler-bin-wrapper/Cargo.toml

@@ -11,7 +11,8 @@ profiling = []
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-graph-craft = {path = "../../graph-craft" , features = ["serde"]}
+graph-craft = { path = "../../graph-craft", features = ["serde"] }
+gpu-executor = { path = "../../gpu-executor" }
 log = "0.4"
 anyhow = "1.0.66"
 serde_json = "1.0.91"