Support for PEP 695 (Type parameters / generics)

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Related to #229: when writing a generic class/function that uses type parameters, the syntax is incorrectly highlighted. This syntax was introduced in 3.12 via [PEP 695](https://peps.python.org/pep-0695/).

Currently these are incorrectly scoped as attribute access (see attached screenshots). MVP to reproduce is simply

```python
class Foo[T]:
pass
```

* **Editor name and version**: Sublime text 4169
* **Platform**: Windows 10
* **Color scheme**: Monokai
* **MagicPython version**: 1.1.1


从 PEP 695 示例开始，在受支持的编辑器中使用 `class Foo[T]: pass` 重现该问题。检查为类型参数语法分配属性访问 scopes 的语法高亮规则。当 PEP 695 形式获得适当的 scopes，并且回归问题已由项目现有的测试覆盖（如果有）时，即表示完成。

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