Groundwork for integrating Specta (#949)

* add derive(specta::Type)

* use specta from git

* introduce Uuid type

* remove unnecessary specta::Type

* document export_types test

* upgrade Specta
The previous Specta branch had some hacks that were just for this project. They have all been converted into proper features so they can be merged into main.

* remove some unnecessary specta::Type uses

* add MessageDiscriminantDef explanation

* manually export types with specta

* rename 'specta.rs' to 'export_types.rs'

* rename 'export_types' to 'generate_ts_types'

---------

Co-authored-by: Oscar Beaumont <oscar@otbeaumont.me>

Cargo.toml

@@ -29,6 +29,9 @@ exclude = [
 	"node-graph/gpu-compiler",
 ]
 
+[workspace.dependencies]
+specta = { git = "https://github.com/oscartbeaumont/rspc", rev = "9725ddbfe40183debc055b88c37910eb6f818eae", features = ["glam"] }
+
 [profile.release.package.graphite-wasm]
 opt-level = 3