Init Actors
Init actors are actors made to be an "entrypoint" into a Comunica system, usually by making use of command line arguments.
The default interface and bus can be found in @comunica/bus-init.
Their input action contains everything required to accept all the user input:
an argv string array,
an env object mapping the environment and
a stdin input stream.
@comunica/runner-cli
can be used to start up a Comunica process while parsing the command line arguments and sending them to the init actor.