feat: 2d training

[KRiedmiller]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 91.09589% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.73%. Comparing base (3de2117) to head (56ad775).
⚠️ Report is 12 commits behind head on main.

Files with missing lines	Patch %	Lines
panseg/functionals/training/h5dataset.py	85.00%	6 Missing ⚠️
panseg/tasks/training_tasks.py	16.66%	5 Missing ⚠️
panseg/viewer_napari/widgets/training.py	81.81%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #573      +/-   ##
==========================================
- Coverage   89.93%   89.73%   -0.21%     
==========================================
  Files         105      108       +3     
  Lines       10990    11163     +173     
==========================================
+ Hits         9884    10017     +133     
- Misses       1106     1146      +40     

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