add multi-label support to measure container

[TimMonko]

and other fixes, including logging info, progress bar for grouping

[codecov]

Codecov Report

Attention: Patch coverage is 85.50725% with 10 lines in your changes missing coverage. Please review.

Project coverage is 80.96%. Comparing base (de69f2e) to head (d19fb7e).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
src/napari_ndev/widgets/_measure_container.py	79.59%	6 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #87      +/-   ##
==========================================
+ Coverage   80.89%   80.96%   +0.07%     
==========================================
  Files          28       28              
  Lines        2157     2186      +29     
  Branches      149      152       +3     
==========================================
+ Hits         1745     1770      +25     
- Misses        365      367       +2     
- Partials       47       49       +2     

Flag	Coverage Δ
unittests	80.96% <85.50%> (+0.07%)	⬆️

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