Introduce new tasks metadata

[tcompa]

Requires fractal-tasks-core 1.3.3, examples in fractal-analytics-platform/fractal-tasks-core#855.

1. For authors, we could maybe re-use the one which is set in pyproject.toml through copier?
2. For category, modality and tags we should show where they should be set.

[jluethi]

+1 on getting author info via copier

For the others, let's just add an entry of each to the example tasks we provide, e.g. the thresholding label task has:
category: Segmentation
tags: "Classical segmentation"

(I don't think that task is modality specific, maybe we add a modality specific example in the future)

[lorenzocerrone]

This pull request partially resolves this issue #18

But from what I can see the author field is not yet exposed in tasks-core:
https://github.com/fractal-analytics-platform/fractal-tasks-core/blob/9e4efc455ca1c2b9867a8dae6b024b1733a8464d/fractal_tasks_core/dev/task_models.py#L25C1-L38C1

Am I getting it wrong? @tcompa

Resolved! Sorry I did not get the Author was for whole package