make backward compatible

Author: lohanidamodar

templates/dart/lib/src/input_file.dart.twig

@@ -6,6 +6,13 @@ class InputFile {
   final String? filename;
   final String? contentType;
 
+  @Deprecated('Use `InputFile.fromPath` or `InputFile.fromBytes` instead.')
+  InputFile({this.path, this.filename, this.contentType, this.bytes}) {
+    if (path == null && bytes == null) {
+      throw AppwriteException('One of `path` or `bytes`  is required');
+    }
+  }
+
   InputFile._({this.path, this.filename, this.contentType, this.bytes}) {
     if (path == null && bytes == null) {
       throw AppwriteException('One of `path` or `bytes`  is required');