No freezing GUI when loading umap / writing targers by adding threading + Visualize loading with spinners

[thorstenwagner]

No description provided.

[codecov]

Codecov Report

Attention: 53 lines in your changes are missing coverage. Please review.

Comparison is base (6dcbd4a) 33.77% compared to head (849b864) 30.23%.

Files	Patch %	Lines
src/napari_tomotwin/load_umap.py	0.00%	39 Missing ⚠️
src/napari_tomotwin/make_targets.py	0.00%	13 Missing ⚠️
src/napari_tomotwin/_tests/test_load_umap.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #20      +/-   ##
==========================================
- Coverage   33.77%   30.23%   -3.55%     
==========================================
  Files           5        5              
  Lines         225      258      +33     
==========================================
+ Hits           76       78       +2     
- Misses        149      180      +31     

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