chore: Add unit tests for ToolboxSyncClient (#225)

* chore: Add unit test cases

* chore: Delint

* feat: Warn on insecure tool invocation with authentication

This change introduces a warning that is displayed immediately before a tool invocation if:
1. The invocation includes an authentication header.
2. The connection is being made over non-secure HTTP.

> [!IMPORTANT]
The purpose of this warning is to alert the user to the security risk of sending credentials over an unencrypted channel and to encourage the use of HTTPS.

* fix!: Warn about https only during tool initialization

* chore: Add unit tests for ToolboxSyncClient

* chore: Delint

* chore: Refactor sync client tests to be grouped together in classes

These also help identify differences with the existing async client tests.

* chore: Delint

Author: anubhav756

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

@@ -11,6 +11,8 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
+
 import types
 from typing import Any, Callable, Coroutine, Mapping, Optional, Union