Missing information on target types and their supported domains

[joffrey-bion]

In the formal protocol definitions, we get a list of domains (with details about types, commands, and events).

However, not all targets support all domains, and there is currently no place in the protocol definitions that lists the domains supported by each target type, or the target types support by each domain.

There isn't even a list of the possible target types themselves: the TargetInfo.type description just points to constants defined in Chromium source code, which makes it impossible to parse automatically.

Could this information be added somehow?