Shaders: rust-gpu integration to compile shader nodes to WGSL (#3097)

* shaders: shader compilation setup

* nix: use rustc_codegen_spirv.so from nix

* shaders: codegen for per_pixel_adjust shader nodes

* shaders: disable nodes needing bool

* shaders: `#[repr(u32)]` some enums

* shaders: add lint ignores from rust-gpu

* shaders: fix node-macro tests

* gcore-shaders: toml cleanup

* shader-nodes feature: put rust-gpu to wgsl compile behind feature gate

* shaders: fix use TokenStream2

* shaders: allow providing shader externally

* Update iai runner in workflow

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Co-authored-by: Timon Schelling <me@timon.zip>
Co-authored-by: Dennis Kobert <dennis@kobert.dev>

node-graph/gcore-shaders/Cargo.toml

@@ -7,7 +7,23 @@ authors = ["Graphite Authors <contact@graphite.rs>"]
 license = "MIT OR Apache-2.0"
 
 [features]
-std = ["dep:dyn-any", "dep:serde", "dep:specta", "dep:log", "glam/debug-glam-assert", "glam/std", "glam/serde", "half/std", "half/serde", "num-traits/std"]
+# any feature that
+# * must be usable in shaders
+# * but requires std
+# * and should be on by default
+# should be in this list instead of `[workspace.dependency]`
+std = [
+	"dep:dyn-any",
+	"dep:serde",
+	"dep:specta",
+	"dep:log",
+	"glam/debug-glam-assert",
+	"glam/std",
+	"glam/serde",
+	"half/std",
+	"half/serde",
+	"num-traits/std"
+]
 
 [dependencies]
 # Local std dependencies