feat: add w3c header example buttons

Author: ahmedAlaaInstabug

example/lib/src/components/network_content.dart

@@ -24,14 +24,25 @@ class _NetworkContentState extends State<NetworkContent> {
           text: 'Send Request To Url',
           onPressed: () => _sendRequestToUrl(endpointUrlController.text),
         ),
+        Text("W3C Header Section"),
+        InstabugButton(
+          text: 'Send Request With Custom traceparent header',
+          onPressed: () => _sendRequestToUrl(endpointUrlController.text,headers: {
+            "traceparent":"Custom traceparent header"
+          }),
+        ),
+        InstabugButton(
+          text: 'Send Request  Without Custom traceparent header',
+          onPressed: () => _sendRequestToUrl(endpointUrlController.text),
+        ),
       ],
     );
   }
 
-  void _sendRequestToUrl(String text) async {
+  void _sendRequestToUrl(String text,{Map<String,String>? headers}) async {
     try {
       String url = text.trim().isEmpty ? widget.defaultRequestUrl : text;
-      final response = await http.get(Uri.parse(url));
+      final response = await http.get(Uri.parse(url),headers: headers);
 
       // Handle the response here
       if (response.statusCode == 200) {