Question: How do you recommend enforcing authorization?

Hello,

I'd like to systematically enforce authorization for nodes and individual fields within the nodes.

Conceptually something like this might work:

```python
class MyNode(AuthZSQLAlchemyObjectType):
class Meta:
model = MyModel
authorize_node_function = node_authorizer
field_auth = dict(
"name": all_authorizer,
"private_things": self_only_authorizer,
)
```

`node_authorizer(model_instance)` would get called whenever a new Node of that type is created. Only fields in the field_auth dict would be exposed in node, and then the associated function would be called like `resolve_authorizer(model_instance, field_name)`

Any opinions on the best way to achieve this?

該 issue 沒有列出檔案、測試或進入點；請先檢視提議的 AuthZSQLAlchemyObjectType、node_authorizer 和 field_auth 介面。在實作之前，先與維護者釐清節點層級和欄位層級的預期行為，因為該 issue 沒有定義具體的變更，也沒有說明怎樣才算完成。

由索引模型根據 Issue 內容生成。