Based on this APX task: https://github.com/Apricot-Therapeutics/APx_fractal_task_collection/blob/main/src/apx_fractal_task_collection/tasks/label_assignment_by_overlap.py

@adrtsc Just an FYI: I've refactored the label_assignment_by_overlap task and added it to the helper task package so far (didn't want to start a whole large ngio refactor of the task).

Main goals:

• Use new ngio functionality for label & table loading/writing => makes it compatible with e.g. yx labels vs. zyx labels, new table backends etc.
• Switch from compound task to parallel task: Drops the option of handling labels distributed across multiplexing cycles. But makes using the task in Fractal setups much easier (e.g. handling partial failures better due to current Fractal limits with compound tasks in the flexibility setup)

I kept all the core overlap logic the same, just updated the task logic