Add Ability to overwrite task settings when calling a task in Functional API

Currently, a common pattern is:

t = MyTask(name="test task", tags=["A"])

with Flow() as f:
   res1 = t(1)
   res2 = t(2)
   ...

and each individual copied instance of the task will appear with the same name "test task" in the UI and any other place that information is surfaced.

To allow for more nuanced control of the copying of tasks, we should add a reserved kwarg _task_args to task call signatures which allow for overriding things (such as name) when calling / copying the task.

[jlowin]

I think this feature is going to add a lot of utility to FunctionTasks (and the @task decorator more broadly) because it will allow those tasks to be reused without having to rewrite them. Currently, to use the same @task-decorated function as a task with two different retry behaviors, you have to rewrite the decorated function just to change the retry value. With this kwarg, you could affect the same behavior much more cleanly. I’d vote that this is a very explicit form of controlling behavior and should have a very explicit implementation.

[cicdw]

Good point 👍🏻👍🏻