Add data model and structure for swift graph executor, rework create products to bem ore general

FastCoster/FastCoster/Model/Graph.swift

@@ -0,0 +1,23 @@
+//
+//  Graph.swift
+//  FastCoster
+//
+//  Created by Michael Pivato on 3/5/2024.
+//
+
+import Foundation
+// JSON for saving/loading configuration: https://www.avanderlee.com/swift/json-parsing-decoding/
+struct Node: Codable {
+    var id: Int
+    var info: NodeInfo
+    var dependentNodeIds: [Int]
+    
+    func hasDependentNodes() -> Bool {
+        return !dependentNodeIds.isEmpty
+    }
+}
+
+struct Graph: Codable {
+    var name: String
+    var nodes: [Node]
+}