Instance tables refactor part 4: replace ArtboardGroups with multi-row Instances<Artboard> (#2265)

* Clean up dyn_any usages

* Migrate ArtboardGroup to ArtboardGroupTable (not yet flattened)

* Reorder graphical data imports

* Flatten and remove ArtboardGroup in favor of ArtboardGroupTable

* Fix test

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

@@ -923,12 +923,12 @@ mod test {
 		assert_eq!(
 			ids,
 			vec![
-				NodeId(12083027370457564588),
-				NodeId(10127202135369428481),
-				NodeId(3781642984881236270),
-				NodeId(12160249450476233602),
-				NodeId(17962581471057044127),
-				NodeId(7906594012485169109)
+				NodeId(907133870432995942),
+				NodeId(13049623730817360317),
+				NodeId(2177355904460308500),
+				NodeId(17479234042764485524),
+				NodeId(10988236038173832469),
+				NodeId(11097818235165626738),
 			]
 		);
 	}