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'

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

node-graph/graph-craft/src/document/value.rs

@@ -7,7 +7,7 @@ pub use std::sync::Arc;
 pub use crate::imaginate_input::{ImaginateMaskStartingFill, ImaginateSamplingMethod, ImaginateStatus};
 
 /// A type that is known, allowing serialization (serde::Deserialize is not object safe)
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, specta::Type)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub enum TaggedValue {
 	None,