feature: Add UrlNavigationRequest url type and checks for url validation

Author: Alexander-Ordina

lib/src/chatbox.dart

@@ -56,8 +56,25 @@ class MessageActionEvent {
 enum UrlNavigationAction { allow, deny }
 
 class UrlNavigationRequest {
-  final url;
-  UrlNavigationRequest(this.url);
+  final Uri? url;
+  final String rawUrl;
+  final bool isValidUrl;
+
+  UrlNavigationRequest._(
+    this.url, 
+    this.rawUrl,
+    this.isValidUrl,
+  ) ;
+
+  factory UrlNavigationRequest(String url){
+    final Uri? uri = Uri.tryParse(url);
+
+    return UrlNavigationRequest._(
+      uri,
+      url,
+      uri!=null,
+    );
+  }
 }
 
 /// A messaging UI for just a single conversation.