Added the functionality to add RelayNode directly to edge between two Prot;

Sample/GraphAsset.asset

@@ -13,9 +13,9 @@ MonoBehaviour:
   m_Name: GraphAsset
   m_EditorClassIdentifier: 
   _nodes:
-  - rid: 299037570321612880
   - rid: 299037570321612881
   - rid: 299037570321612882
+  - rid: 299037621810888806
   _stickyNotes:
   - _id: 940a3025-e571-4b33-8d7c-c86761a95017
     title: Title
@@ -36,26 +36,26 @@ MonoBehaviour:
       direction: 0
       valueType: System.Single
     _outputSlotData:
-      slotName: _result
-      nodeID: 31f46c9e-45f1-418a-bb4b-cc843ea9242a
+      slotName: Output
+      nodeID: c9e7e09c-b463-42ad-b855-9081abb68942
       slotIndex: 0
       direction: 1
-      valueType: System.Single
+      valueType: System.Object
   - _inputSlotData:
-      slotName: a
-      nodeID: 31f46c9e-45f1-418a-bb4b-cc843ea9242a
-      slotIndex: 0
-      direction: 0
-      valueType: System.Single
-    _outputSlotData:
       slotName: value
       nodeID: 5ee073fb-e411-4061-867a-9ce3afd9a188
       slotIndex: 0
       direction: 1
       valueType: System.Object
+    _outputSlotData:
+      slotName: Input
+      nodeID: c9e7e09c-b463-42ad-b855-9081abb68942
+      slotIndex: 0
+      direction: 0
+      valueType: System.Object
   _exposedProperties:
   - rid: 299037523270959195
-  graphPosition: {x: 131.33333, y: -8, z: 0}
+  graphPosition: {x: 224, y: 84.666664, z: 0}
   graphScale: {x: 1, y: 1, z: 1}
   references:
     version: 2
@@ -68,58 +68,6 @@ MonoBehaviour:
         propertyType: Misaki.GraphView.Sample.FloatProperty
         showInInspector: 1
         value: 1
-    - rid: 299037570321612880
-      type: {class: Add, ns: Misaki.GraphView.Sample, asm: GraphView.Sample}
-      data:
-        graphObject: {fileID: 11400000}
-        id: 31f46c9e-45f1-418a-bb4b-cc843ea9242a
-        position:
-          serializedVersion: 2
-          x: 534
-          y: 418
-          width: 116.66669
-          height: 102.66666
-        _inputs:
-        - _linkedSlotData:
-          - slotName: value
-            nodeID: 5ee073fb-e411-4061-867a-9ce3afd9a188
-            slotIndex: 0
-            direction: 1
-            valueType: System.Object
-          owner:
-            rid: 299037570321612880
-          slotData:
-            slotName: a
-            nodeID: 31f46c9e-45f1-418a-bb4b-cc843ea9242a
-            slotIndex: 0
-            direction: 0
-            valueType: System.Single
-        - _linkedSlotData: []
-          owner:
-            rid: 299037570321612880
-          slotData:
-            slotName: b
-            nodeID: 31f46c9e-45f1-418a-bb4b-cc843ea9242a
-            slotIndex: 1
-            direction: 0
-            valueType: System.Single
-        _outputs:
-        - _linkedSlotData:
-          - slotName: _input
-            nodeID: 1d18af80-6a54-4cdc-b49c-b53e74f56404
-            slotIndex: 0
-            direction: 0
-            valueType: System.Single
-          owner:
-            rid: 299037570321612880
-          slotData:
-            slotName: _result
-            nodeID: 31f46c9e-45f1-418a-bb4b-cc843ea9242a
-            slotIndex: 0
-            direction: 1
-            valueType: System.Single
-        a: 1
-        b: 1
     - rid: 299037570321612881
       type: {class: Output, ns: Misaki.GraphView.Sample, asm: GraphView.Sample}
       data:
@@ -127,17 +75,27 @@ MonoBehaviour:
         id: 1d18af80-6a54-4cdc-b49c-b53e74f56404
         position:
           serializedVersion: 2
-          x: 760
-          y: 418
+          x: 709.7862
+          y: 417.86685
           width: 124.66669
           height: 78.66666
         _inputs:
         - _linkedSlotData:
           - slotName: _result
-            nodeID: 31f46c9e-45f1-418a-bb4b-cc843ea9242a
+            nodeID: fea7bcdd-0c2a-464f-a21a-126383bafb2e
             slotIndex: 0
             direction: 1
             valueType: System.Single
+          - slotName: Output
+            nodeID: 104c0451-a164-449e-9d90-d629cdc33150
+            slotIndex: 0
+            direction: 1
+            valueType: System.Object
+          - slotName: Output
+            nodeID: c9e7e09c-b463-42ad-b855-9081abb68942
+            slotIndex: 0
+            direction: 1
+            valueType: System.Object
           owner:
             rid: 299037570321612881
           slotData:
@@ -154,18 +112,28 @@ MonoBehaviour:
         id: 5ee073fb-e411-4061-867a-9ce3afd9a188
         position:
           serializedVersion: 2
-          x: 357.66666
-          y: 484.6665
+          x: 264
+          y: 460
           width: 98.66666
-          height: 36
+          height: 35.99997
         _inputs: []
         _outputs:
         - _linkedSlotData:
           - slotName: a
-            nodeID: 31f46c9e-45f1-418a-bb4b-cc843ea9242a
+            nodeID: fea7bcdd-0c2a-464f-a21a-126383bafb2e
             slotIndex: 0
             direction: 0
             valueType: System.Single
+          - slotName: Input
+            nodeID: 104c0451-a164-449e-9d90-d629cdc33150
+            slotIndex: 0
+            direction: 0
+            valueType: System.Object
+          - slotName: Input
+            nodeID: c9e7e09c-b463-42ad-b855-9081abb68942
+            slotIndex: 0
+            direction: 0
+            valueType: System.Object
           owner:
             rid: 299037570321612882
           slotData:
@@ -176,3 +144,15 @@ MonoBehaviour:
             valueType: System.Object
         _property:
           rid: 299037523270959195
+    - rid: 299037621810888806
+      type: {class: RelayNode, ns: Misaki.GraphView, asm: GraphView}
+      data:
+        graphObject: {fileID: 11400000}
+        id: c9e7e09c-b463-42ad-b855-9081abb68942
+        position:
+          serializedVersion: 2
+          x: 500.66666
+          y: 462.66666
+          width: 74.66669
+          height: 33.333313
+        portValueType: System.Single