Optional Shorter `create` Functions

[lilBunnyRabbit]

Introduce more concise task and task group creation methods.

TODO:

• Implement createTask(name: string, execute: (...T) => R).
• Implement createGroup(name: string, tasks: ExecutableTask[]).
• Implement createGroup(name: string, tasks: (...T) => ExecutableTask[]).
• Ensure type safety and usability.