feat: Ability to call any custom Squirrel function

src/pyg2o/functions/pyg2o.py

@@ -0,0 +1,10 @@
+from ..server import PythonWebsocketServer
+
+async def call_squirrel_function(function_name: str, *args):
+    
+    arg_list = ', '.join(args)
+    data = f'return {function_name}({arg_list})'
+    
+    server = await PythonWebsocketServer.get_server()
+    result = await server.make_request(data)
+    return result