Move Forge Remote primitives from core to the api module

[tbinna]

Everything Forge Remote is currently defined in the core module. This does not make much sense when we want to define new API modules based on the api module. Since Forge Remote primitives are missing in the api module, we must then pull in core into API modules that are intended to be based solely on api.

The goal is to pull Forge Remote primities such as ForgeRemoteContext from core into the api package.

ForgeRemoteContext is essentially the equivalent of AtlassianHostUser in core.