Re-factor package structure and add tasks dependency extra

[tcompa]

Ref #378

[jluethi]

Can we make the extra fractal-tasks? In that way, we can include a consistent fractal-tasks extra for our package and external packages

[tcompa]

Can we make the extra fractal-tasks? In that way, we can include a consistent fractal-tasks extra for our package and external packages

Sure. We can have a tasks folder and a fractal_tasks_core[fractal_tasks] extra.

[github-actions]

Coverage report

The coverage rate went from 81.07% to 81.46% ⬆️
The branch rate is 75%.

82.6% of new lines are covered.

Diff Coverage details (click to unfold)

fractal_tasks_core/tasks/create_ome_zarr.py

0% of new lines are covered (82.75% of the complete file).
Missing lines: 433

fractal_tasks_core/tasks/create_ome_zarr_multiplex.py

0% of new lines are covered (86.83% of the complete file).
Missing lines: 484

fractal_tasks_core/tasks/yokogawa_to_ome_zarr.py

0% of new lines are covered (84.25% of the complete file).
Missing lines: 219

fractal_tasks_core/lib_ROI_overlaps.py

100% of new lines are covered (94.97% of the complete file).

fractal_tasks_core/tasks/illumination_correction.py

0% of new lines are covered (76.69% of the complete file).
Missing lines: 274

fractal_tasks_core/tasks/copy_ome_zarr.py

0% of new lines are covered (89.32% of the complete file).
Missing lines: 200

fractal_tasks_core/tasks/maximum_intensity_projection.py

0% of new lines are covered (85.71% of the complete file).
Missing lines: 135

fractal_tasks_core/tasks/cellpose_segmentation.py

0% of new lines are covered (81.87% of the complete file).
Missing lines: 666

fractal_tasks_core/tasks/napari_workflows_wrapper.py

0% of new lines are covered (89.36% of the complete file).
Missing lines: 606