Added defualt graph properties inspector;

Added sticky note;

Changed the name of BaseNode to SlotContainerNode in case we need other type of nodes in the future;

Sample/Runtime/Models/Nodes/AddNode.cs

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+#if UNITY_EDITOR
+using Misaki.GraphView.Editor;
+#endif
+
+namespace Misaki.GraphView.Sample
+{
+    [NodeInfo("Add", "Math")]
+    public class AddNode : BackTraceNode
+    {
+        [NodeInput]
+#if UNITY_EDITOR
+        [InspectorInput]
+#endif
+        public float a;
+
+        [NodeInput]
+#if UNITY_EDITOR
+        [InspectorInput]
+#endif
+        public float b;
+
+        [NodeOutput] 
+        private float _result;
+
+        protected override bool OnExecute()
+        {
+            _result = a + b;
+
+            return true;
+        }
+    }
+}

Sample/Runtime/Models/Nodes/AddNode.cs.meta

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+fileFormatVersion: 2
+guid: fe1c51aa37dba09468a65f5594146083

Sample/Runtime/Models/Nodes/BaseClasses.meta

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+fileFormatVersion: 2
+guid: eb7bc6eed66a1dd4ca8c71908a3b3874
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Sample/Runtime/Models/Nodes/BaseClasses/BackTraceNode.cs

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+namespace Misaki.GraphView.Sample
+{
+    public abstract class BackTraceNode : SlotContainerNode
+    {
+        protected override void OnPullData(Slot input)
+        {
+            if (input.LinkedSlotData.Count == 0)
+            {
+                return;
+            }
+            
+            var outputNode = GraphObject.GetNode(input.LinkedSlotData[0].nodeID);
+            outputNode.Execute();
+        }
+    }
+}

Sample/Runtime/Models/Nodes/BaseClasses/BackTraceNode.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: a761276bd0f3a4a4cb4b0894d193f4cd

Sample/Runtime/Models/Nodes/OutputNode.cs

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+using UnityEngine;
+
+namespace Misaki.GraphView.Sample
+{
+    [NodeInfo("Output Node", "Output")]
+    public class OutputNode : BackTraceNode
+    {
+        [NodeInput]
+        private float _input;
+        
+        protected override bool OnExecute()
+        {
+            GraphObject.Logger.LogInfo(this, $"{_input}");
+
+            return true;
+        }
+    }
+}

Sample/Runtime/Models/Nodes/OutputNode.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 42ed2641b4fc11240be0abda76236178