mask conversion UI dialog (uint64 to bool)

[TeunHuijben]

Problem:
The geff stores our masks and bounding boxes to display the segmentation. The problem is that previously, these masks were saved as uint64. On disc, this is fine, because zarr compression can do a lot on binary masks. However, when loading the geff into memory (like we do in motile_tracker), it makes memory explode, because the binary masks are loaded as full uint64. Actually, funtracks uses the tracksdata functionality to load the geff, and tracksdata casts to bools upon loading, but the problem is the geff.load which goes through uint64 because that is the type it sees.

Tracksdata has been updated to export the masks as bool, so every future geff will have boolean masks (once tracksdata>funtracks>motile_tracker all use the latest releases). However, in the meantime, all previously saved geffs have the masks as uint64.

This PR:
When loading a geff in which the masks are saved as uint64, the UI pops up a window with the question to convert the masks to booleans. This will duplicate the geff with the masks as booleans and load that one. This is a tracksdata utility that motile_tracker uses, and the conversion is fast, because it works on chunks, so OOM is not a risk.

For small datasets, this won't be a problem, but for larger datasets (>25k nodes) on smaller laptops, the 8-fold memory increase because of uint64 is a major problem.

🔴 currently blocked until royerlab/tracksdata#319 is merged and part of the next tracksdata release

[codecov-commenter]

Codecov Report

❌ Patch coverage is 22.58065% with 24 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.38%. Comparing base (25f0e9d) to head (d06e006).

Files with missing lines	Patch %	Lines
...otile_tracker/import_export/menus/import_dialog.py	22.58%	24 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #462      +/-   ##
==========================================
- Coverage   87.74%   87.38%   -0.37%     
==========================================
  Files          57       57              
  Lines        5493     5524      +31     
==========================================
+ Hits         4820     4827       +7     
- Misses        673      697      +24     

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