New returns a new instance of Scheduler.

ContextCancelledStatus specifies the context has been cancelled probably due to timeout.

RunningStatus specifies the scheduler is in the main loop processing chains.

Shutdown specifies proper termination of the session.

BuiltinTasks maps builtin task names with event handlers.

Cmd executes a command.

Scheduler is the main class for running the tasks.

RunStatus specifies the current status of execution.