vkGetFenceStatus and VK_ERROR_DEVICE_LOST

The `vkGetFenceStatus` function can return `VK_SUCCESS`, `VK_NOT_READY`, `VK_ERROR_DEVICE_LOST`, or OOM errors.

Imagine the following:

- I submit something to a queue with `vkQueueSubmit` and pass a fence.
- After a few seconds I call `vkGetFenceStatus`, which returns `VK_SUCCESS`.
- I unplug my video card.
- I call `vkGetFenceStatus` again.

Should the second call return `VK_SUCCESS` or `VK_ERROR_DEVICE_LOST`?
In other words should the implementation check for a lost device even though it knows for sure that the fence is signaled?

Same problem for `VK_NOT_READY`.

Start by reading the vkGetFenceStatus and vkQueueSubmit specification text and the listed return-status definitions. Resolve whether a signaled or unsignaled fence should still report VK_ERROR_DEVICE_LOST after device loss, then update the relevant specification wording once the expected behavior is decided.

Written by the indexing model from the issue text.