Deserialize `Command`s to a structure like CdpEvent/CdpEventMessage

[lf-]

I am implementing a Chrome DevTools server (with very limited scope; just Network) and it seems that the chromiumoxide_cdp types are not really set up for deserializing Command structures, only Events.

It would be useful to have generated enums for these so that the system can be run the other way around. For now I'm just going to implement it manually downstream as I don't intend to support much of the protocol, so this is a very low priority feature request.