[WIP] feat: A vispy-based stage tracker

[fdrgsp]

In this very WIP PR I started thinking about a widget that tracks the stage movements and is able to record the positions (and move to new positions with double-click). The widget is named StageTracker. To see an example of usage run the stage_tracker.py example.

Screen.Recording.2024-06-24.at.8.03.00.PM.mov

NOTE: there is also a version named StageRecorder that is also adding the snapped images in the canvas. This requires more work on how to downsacale the images, etc... To see an example run the stage_recorder.py example.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 481 lines in your changes missing coverage. Please review.

Project coverage is 86.30%. Comparing base (33c1350) to head (b5085d1).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
src/pymmcore_widgets/_stage_recorder.py	0.00%	265 Missing ⚠️
src/pymmcore_widgets/_stage_tracker.py	0.00%	216 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #305      +/-   ##
==========================================
- Coverage   90.73%   86.30%   -4.44%     
==========================================
  Files          85       87       +2     
  Lines        9233     9858     +625     
==========================================
+ Hits         8378     8508     +130     
- Misses        855     1350     +495     

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[tlambert03]

this is a pretty awesome feature @fdrgsp, and it would be good to get something like this in. For the sake of review, I think it would be helpful for me to get your thoughts on some high level things, such as what use cases this could serve, and also what the public API of the various objects should be. I know I can look at the code, but could you also comment here on the main objects and what they do? Does this build an image map of visited locations (hard to tell from your demo). Does it work with z positions? etc... basically, guide us a bit more through what your vision is here, in words