fix: Restore type hints for low-level api

llama_cpp/llama_cpp.py

@@ -109,12 +109,13 @@ if TYPE_CHECKING:
 
     CtypesFuncPointer: TypeAlias = ctypes._FuncPointer  # type: ignore
 
+F = TypeVar("F", bound=Callable[..., Any])
 
 def ctypes_function_for_shared_library(lib: ctypes.CDLL):
     def ctypes_function(
         name: str, argtypes: List[Any], restype: Any, enabled: bool = True
     ):
-        def decorator(f: Callable[..., Any]):
+        def decorator(f: F) -> F:
             if enabled:
                 func = getattr(lib, name)
                 func.argtypes = argtypes