The "required format tables" aren't reflected in `vk.xml`

Currently, the tables in the Formats chapter that associate required format properties with formats are hand-written and aren't reflected in any form in vk.xml. This means that, for example, we can't reliably write tools to ask questions like "What, if any, formats are required to support usage bits X and Y"?

The markdown tables are here:

https://github.com/KhronosGroup/Vulkan-Docs/blob/main/chapters/formats.adoc#required-format-support

Note that (even though nobody should be doing this!) even the markdown is hard to parse as there are embedded ifdef statements. I've done it, and I wish I hadn't. 😆