* Remove `AuthProvider` interface from `World` and associated implementations
The `getAuthInfo()` and `checkHealth()` were never being used. Let's
from from the World interface to simplify things for implementors.
* .
* .
* Some housekeeping on unnecessary dependencies
* Remove `@types/json-schema` dependency (not used) (`world`)
* Remove `@types/node` from being a peerDependency (`world`)
* Move `@types/watchpack` to be a devDependency (`cli`)
* .