Package cgc is a package that allows you pass a function for another goroutine to execute it.
It is useful when some logic must be run on a separate thread and you want to wait for the result, or you want to cancel a foreign function with Go's context cancellation mechanism.
The package provides a event queue named Executor. You can make use of
Executor to listen to requests from one goroutine, and send requests to it
from any other goroutines.