[SDK-695] Add avatar creator poc sample (#182)

## [SDK-695](https://ready-player-me.atlassian.net/browse/SDK-695)

## Description

- Add avatar creator POC sample using new elements

Runtime/AvatarCreator/UI/Elements/AssetSelectionElement.cs

@@ -47,16 +47,18 @@ public async Task LoadAssetData(OutfitGender gender)
         /// Asynchronously loads the template data and creates button elements for each asset. 
         /// Buttons are created with icons fetched based on the asset's image URL and icon size.
         /// </summary>
-        public async void LoadAndCreateButtons(OutfitGender gender)
+        public async Task LoadAndCreateButtons(OutfitGender gender)
         {
             await LoadAssetData(gender);
-            CreateButtons(assets.ToArray(), async (button, asset) =>
-            {
-                var webRequestDispatcher = new WebRequestDispatcher();
-                var url = iconSize > 0 ? $"{asset.ImageUrl}?w={iconSize}" : asset.ImageUrl;
-                var texture = await webRequestDispatcher.DownloadTexture(url);
-                button.SetIcon(texture);
-            });
+            CreateButtons(assets.ToArray(), OnButtonCreated);
+        }
+
+        private async void OnButtonCreated(ButtonElement button, PartnerAsset asset)
+        {
+            var webRequestDispatcher = new WebRequestDispatcher();
+            var url = iconSize > 0 ? $"{asset.ImageUrl}?w={iconSize}" : asset.ImageUrl;
+            var texture = await webRequestDispatcher.DownloadTexture(url);
+            button.SetIcon(texture);
         }
     }
 }

Samples~/AvatarCreatorPOC/Animation/AnimationController.controller

@@ -0,0 +1,72 @@
+%YAML 1.1
+%TAG !u! tag:unity3d.com,2011:
+--- !u!91 &9100000
+AnimatorController:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_Name: AnimationController
+  serializedVersion: 5
+  m_AnimatorParameters: []
+  m_AnimatorLayers:
+  - serializedVersion: 5
+    m_Name: Base Layer
+    m_StateMachine: {fileID: 2944382419493117949}
+    m_Mask: {fileID: 0}
+    m_Motions: []
+    m_Behaviours: []
+    m_BlendingMode: 0
+    m_SyncedLayerIndex: -1
+    m_DefaultWeight: 0
+    m_IKPass: 0
+    m_SyncedLayerAffectsTiming: 0
+    m_Controller: {fileID: 9100000}
+--- !u!1107 &2944382419493117949
+AnimatorStateMachine:
+  serializedVersion: 6
+  m_ObjectHideFlags: 1
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_Name: Base Layer
+  m_ChildStates:
+  - serializedVersion: 1
+    m_State: {fileID: 4750699249463508156}
+    m_Position: {x: 302.5, y: 94, z: 0}
+  m_ChildStateMachines: []
+  m_AnyStateTransitions: []
+  m_EntryTransitions: []
+  m_StateMachineTransitions: {}
+  m_StateMachineBehaviours: []
+  m_AnyStatePosition: {x: 50, y: 20, z: 0}
+  m_EntryPosition: {x: 50, y: 120, z: 0}
+  m_ExitPosition: {x: 800, y: 120, z: 0}
+  m_ParentStateMachinePosition: {x: 800, y: 20, z: 0}
+  m_DefaultState: {fileID: 4750699249463508156}
+--- !u!1102 &4750699249463508156
+AnimatorState:
+  serializedVersion: 6
+  m_ObjectHideFlags: 1
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_Name: Pointing Forward
+  m_Speed: 1
+  m_CycleOffset: 0
+  m_Transitions: []
+  m_StateMachineBehaviours: []
+  m_Position: {x: 50, y: 50, z: 0}
+  m_IKOnFeet: 0
+  m_WriteDefaultValues: 1
+  m_Mirror: 0
+  m_SpeedParameterActive: 0
+  m_MirrorParameterActive: 0
+  m_CycleOffsetParameterActive: 0
+  m_TimeParameterActive: 0
+  m_Motion: {fileID: 7400000, guid: 81bfdad495dec1848ae5e0145d9bfaca, type: 2}
+  m_Tag: 
+  m_SpeedParameter: 
+  m_MirrorParameter: 
+  m_CycleOffsetParameter: 
+  m_TimeParameter: