feat: add XYZ scale to ArrayDisplayModel

[tlambert03]

something we've needed here at the QI course...

exposes the ability to set the scale part of the transform (and only the scale for now) on the image being displayed. mostly needed for anisotropic z sampling

may introduce some additional changes needed for the camera centering

[codecov]

Codecov Report

❌ Patch coverage is 64.70588% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 44.85%. Comparing base (52fcfc6) to head (4c1e4fc).

Files with missing lines	Patch %	Lines
src/ndv/models/_array_display_model.py	76.19%	5 Missing ⚠️
src/ndv/views/_pygfx/_array_canvas.py	0.00%	4 Missing ⚠️
src/ndv/controllers/_array_viewer.py	50.00%	3 Missing ⚠️

❌ Your patch check has failed because the patch coverage (64.70%) is below the target coverage (85.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #165       +/-   ##
===========================================
- Coverage   86.11%   44.85%   -41.27%     
===========================================
  Files          46       46               
  Lines        5214     5246       +32     
===========================================
- Hits         4490     2353     -2137     
- Misses        724     2893     +2169     

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[tlambert03]

one challenge this PR generally exposes: how does a user pass data-related metadata (like channel names, scales, etc...). Yes, we support named arrays and we try to get all this info from xarray etc... but i don't want someone to have to create an xarray just to add some metadata. The DataWrapper is the natural place for this to live... but someone shouldn't have to subclass it to customize it (if it's not in the array info itself already).

this PR could just make the visualization possible, without weighing in on the public API