Add type checking to the node graph (#1025)

* Implement type inference

Add type hints to node trait

Add type annotation infrastructure

Refactor type ascription infrastructure

Run cargo fix

Insert infer types stub

Remove types from node identifier

* Implement covariance

* Disable rejection of generic inputs + parameters

* Fix lints

* Extend type checking to cover Network inputs

* Implement generic specialization

* Relax covariance rules

* Fix type annotations for TypErasedComposeNode

* Fix type checking errors

* Keep connection information during node resolution
* Fix TypeDescriptor PartialEq implementation

* Apply review suggestions

* Add documentation to type inference

* Add Imaginate node to document node types

* Fix whitespace in macros

* Add types to imaginate node

* Fix type declaration for imaginate node + add console logging

* Use fully qualified type names as fallback during comparison

---------

Co-authored-by: Keavon Chambers <keavon@keavon.com>

node-graph/graph-craft/src/lib.rs

@@ -1,6 +1,10 @@
 #[macro_use]
 extern crate log;
 
+#[macro_use]
+extern crate graphene_core;
+pub use graphene_core::{concrete, generic, NodeIdentifier, Type, TypeDescriptor};
+
 pub mod document;
 pub mod proto;