New initializes a new Service.

MainServiceKey is key for main service.

Service represents the service's type.

A configuration is the configuration of the main container of the service's instance.

A dependency is a configuration of an other container that runs separately from the service.

Events are emitted by the service whenever the service wants.

Parameter describes the task's inputs, the task's outputs, and the event's data.

Task is a function that requires inputs and returns output.