chore(toolbox-core): Remove unused typevar variables (#232)

* 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: Remove unused typevar variables

Author: anubhav756

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

@@ -15,13 +15,11 @@
 
 import asyncio
 from threading import Thread
-from typing import Any, Callable, Coroutine, Mapping, Optional, TypeVar, Union
+from typing import Any, Callable, Coroutine, Mapping, Optional, Union
 
 from .client import ToolboxClient
 from .sync_tool import ToolboxSyncTool
 
-T = TypeVar("T")
-
 
 class ToolboxSyncClient:
     """

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

@@ -17,13 +17,11 @@
 from asyncio import AbstractEventLoop
 from inspect import Signature
 from threading import Thread
-from typing import Any, Callable, Coroutine, Mapping, Sequence, TypeVar, Union
+from typing import Any, Callable, Coroutine, Mapping, Sequence, Union
 
 from .protocol import ParameterSchema
 from .tool import ToolboxTool
 
-T = TypeVar("T")
-
 
 class ToolboxSyncTool:
     """