types for enums

Hi,

I wondered if you'd consider (or is it already available?) providing types for the enums so we can use type annotations, for example:

```python
from typing import NewType

VkFormat = NewType('VkFormat', int)
VK_FORMAT_UNDEFINED = VkFormat(0)
VK_FORMAT_R4G4_UNORM_PACK8 = VkFormat(1)
...


def some_func(format: VkFormat, ...)
```

