refactor(Core): decompose handleResponse and add ToolCallingRender system

- Extract handleResponse into focused helpers: processToolCall, findTool,
  reportToolNotFound, renderToolCalling, executeToolCall
- Introduce ToolCallingRender sealed interface (Suppress/Default/Custom)
  allowing tools to control how their invocations are rendered
- Add printToolCalling to PrintAdvanceMessageHandler contract
- Implement default tool calling rendering in PrintMessageHandler (blue text)
- Add WriteFileTool for file writing capabilities
- Fix "responce" → "response" typo across Java and Python files
- Improve PythonRunner docker error handling and output messages
- Update Gradle test configuration (maxHeapSize, test logging)

Signed-off-by: zacharias <alienfromdia@proton.me>

examples/external_tools_example.py

@@ -12,8 +12,8 @@ def connect(data):
         s.connect((HOST, PORT))
         data = data + "\n"
         s.sendall(data.encode("utf-8"))
-        responce = s.recv(4096)
-        return responce.decode("utf-8")
+        response = s.recv(4096)
+        return response.decode("utf-8")
 
 def print_output(text):
     data = {"function": "print_output", "container_id": CONTAINER_ID, "text": text}