Wired up multi-version handling patterns

Designs for handling multiple versions of objects have been set, seems clean and scalable. Generic functions for handling maps has been added also, which will cut down time moving forward.

datamodel/low/reference.go

@@ -82,6 +82,17 @@ func (n NodeReference[T]) IsEmpty() bool {
 	return n.KeyNode == nil && n.ValueNode == nil
 }
 
+func (n NodeReference[T]) IsReferenceNode() bool {
+	for k := range n.KeyNode.Content {
+		if k%2 == 0 {
+			if n.KeyNode.Content[k].Value == "$ref" {
+				return true
+			}
+		}
+	}
+	return false
+}
+
 // GenerateMapKey will return a string based on the line and column number of the node, e.g. 33:56 for line 33, col 56.
 func (n NodeReference[T]) GenerateMapKey() string {
 	return fmt.Sprintf("%d:%d", n.ValueNode.Line, n.ValueNode.Column)