Fix pagination issue

Author: VaghinakDev

src/superannotate/lib/infrastructure/services/item_service.py

@@ -103,13 +103,14 @@ def list(self, project_id: int, folder_id: Optional[int], query: Query):
             char_counter = 0
             while values:
                 val = values.pop()
-                if char_counter + len(val) < available_slots:
+                _len = len(str(val)) + 1  # computing ,
+                if char_counter + _len < available_slots:
                     current_chunk.append(val)
-                    char_counter += len(val)
+                    char_counter += _len
                 else:
                     chunks.append(current_chunk)
                     current_chunk = [val]
-                    char_counter = len(val)
+                    char_counter = _len
             if current_chunk:
                 chunks.append(current_chunk)
             for chunk in chunks: