- this adds a simple set of types to the @tryghost/api-framework
package that should describe all of the keys available on a
controller, and then rolls it out to all API controllers
- unfortunately, due to https://github.com/microsoft/TypeScript/issues/47107, we have
to split apart `module.exports` into a variable assignment in order for type-checking
to be done
- the main benefit of this is that `frame` is now typed, and editors understand what keys
are available, so intellisense works properly
refs https://github.com/TryGhost/Toolbox/issues/363
- this API framework is standalone and should be pulled out into a
separate package so we can define its boundaries more clearly, and
promote better testing of smaller parts
