Box big enum variants to satisfy Clippy's lint warnings (#4292)

* Box the `value` field of `NodeGraphMessage::SetInputValue`

* Box the `ExecutionResponse` variant of `NodeGraphUpdate`

* Box the `Layer` variant of `NodeTypeClickTargets`

* Box the `Scope` variant of `ParsedValueSource`

node-graph/node-macro/src/parsing.rs

@@ -65,7 +65,7 @@ pub enum ParsedValueSource {
 	#[default]
 	None,
 	Default(TokenStream2),
-	Scope(Expr),
+	Scope(Box<Expr>),
 }
 
 // #[widget(ParsedWidgetOverride::Hidden)]
@@ -815,7 +815,7 @@ fn parse_field(pat_ident: PatIdent, ty: Type, attrs: &[Attribute]) -> syn::Resul
 	let value_source = match (default_value, scope) {
 		(Some(_), Some(_)) => return Err(Error::new_spanned(&pat_ident, "Cannot have both `default` and `scope` attributes")),
 		(Some(default_value), _) => ParsedValueSource::Default(default_value),
-		(_, Some(scope)) => ParsedValueSource::Scope(scope),
+		(_, Some(scope)) => ParsedValueSource::Scope(Box::new(scope)),
 		_ => ParsedValueSource::None,
 	};