chore: Add unit tests for ToolboxSyncClient

Author: anubhav756

packages/toolbox-core/src/toolbox_core/sync_client.py

@@ -12,6 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+
 import asyncio
 from threading import Thread
 from typing import Any, Callable, Coroutine, Mapping, Optional, TypeVar, Union