feat: Rectangular ROIs

[gselzer]

This PR brings support for (rectangular) ROIs to the new array viewer. This work was updated from the original viewer, and needs to be cleaned up, but does pass current automated tests and works well in my limited manual testing.

TODO:

• Clean - probably lots of cruft from the update
• Test - I remember this being tricky and being why I was motivated to explore a fix to consider passing the model directly to gui view objects #70, but let's give it another shot.

[codecov]

Codecov Report

Attention: Patch coverage is 57.05394% with 207 lines in your changes missing coverage. Please review.

Project coverage is 62.65%. Comparing base (133f7c1) to head (9c6f9c2).

Files with missing lines	Patch %	Lines
src/ndv/views/_vispy/_array_canvas.py	47.40%	81 Missing ⚠️
src/ndv/views/_pygfx/_array_canvas.py	47.29%	78 Missing ⚠️
src/ndv/v1/_old_viewer.py	54.28%	16 Missing ⚠️
src/ndv/views/_qt/_app.py	17.64%	14 Missing ⚠️
src/ndv/controllers/_array_viewer.py	78.26%	10 Missing ⚠️
src/ndv/views/_jupyter/_array_view.py	70.00%	3 Missing ⚠️
src/ndv/views/_qt/_array_view.py	88.46%	3 Missing ⚠️
src/ndv/_types.py	85.71%	1 Missing ⚠️
src/ndv/models/_roi_model.py	94.11%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (133f7c1) and HEAD (9c6f9c2). Click for more details.

HEAD has 7 uploads less than BASE

Flag	BASE (133f7c1)	HEAD (9c6f9c2)
	42	35

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #114      +/-   ##
==========================================
- Coverage   72.43%   62.65%   -9.79%     
==========================================
  Files          48       50       +2     
  Lines        4622     4742     +120     
==========================================
- Hits         3348     2971     -377     
- Misses       1274     1771     +497     

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