feat: Add iframe events support to the webview (#35)

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## [SDK-517](https://ready-player-me.atlassian.net/browse/SDK-517)

## Description

-   Briefly describe what this change will do

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## Changes

#### Added

-   Add user logout and user updated events support





[SDK-517]:
https://ready-player-me.atlassian.net/browse/SDK-517?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

Co-authored-by: Raigo Kõvask <[email protected]>

Runtime/WebViewPanel.cs

@@ -3,6 +3,7 @@
 using ReadyPlayerMe.Core;
 using ReadyPlayerMe.Core.WebView;
 using UnityEngine;
+using UnityEngine.Events;
 
 namespace ReadyPlayerMe.WebView
 {
@@ -23,6 +24,8 @@ public class WebViewPanel : MonoBehaviour
         [SerializeField] public WebViewEvent OnUserSet = new WebViewEvent();
         [SerializeField] public WebViewEvent OnUserAuthorized = new WebViewEvent();
         [SerializeField] public AssetUnlockEvent OnAssetUnlock = new AssetUnlockEvent();
+        [SerializeField] public UnityEvent OnUserLogout = new UnityEvent();
+        [SerializeField] public WebViewEvent OnUserUpdate = new WebViewEvent();
 
         private WebViewBase webViewObject = null;
 
@@ -155,6 +158,12 @@ private void HandleEvents(WebMessage webMessage)
                 case WebViewEvents.USER_AUTHORIZED:
                     OnUserAuthorized?.Invoke(webMessage.GetUserId());
                     break;
+                case WebViewEvents.USER_LOGOUT:
+                    OnUserLogout?.Invoke();
+                    break;
+                case WebViewEvents.USER_UPDATED:
+                    OnUserUpdate?.Invoke(webMessage.GetUserId());
+                    break;
             }
         }