TF-725 Download inline image as base64 data

core/lib/data/network/download/download_client.dart

@@ -1,4 +1,5 @@
 
+import 'dart:convert';
 import 'dart:io';
 
 import 'package:core/core.dart';
@@ -26,4 +27,15 @@ class DownloadClient {
 
     return (responseBody as ResponseBody);
   }
+
+  Future<String?> downloadImageAsBase64(String url) async {
+    try {
+      final response = await _dioClient.get(
+          url,
+          options: Options(responseType: ResponseType.bytes));
+      return base64Encode(response);
+    } catch (e) {
+      return url;
+    }
+  }
 }