Add support for vectors in the bqplot viewers, and vector options in the layer state panel

[CyclingNinja]

Adding functionality for vector scaling and origins in layer state menu

[codecov]

Codecov Report

Attention: Patch coverage is 80.48780% with 16 lines in your changes missing coverage. Please review.

Project coverage is 85.93%. Comparing base (ee93916) to head (cf10b09).
Report is 35 commits behind head on main.

Files with missing lines	Patch %	Lines
glue_jupyter/bqplot/scatter/layer_artist.py	78.94%	16 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #458      +/-   ##
==========================================
- Coverage   86.03%   85.93%   -0.11%     
==========================================
  Files          91       91              
  Lines        5269     5345      +76     
==========================================
+ Hits         4533     4593      +60     
- Misses        736      752      +16     

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[dhomeier]

visual test failure is related to solara fix in #475.
Might want to use some sort of pre-commit setup ;-)

[astrofrog]

This is looking great! I just tried it out, and just have a couple of small comments below.

I think we should probably add a visual test for this - there are a few other existing visual tests, maybe you can copy one of those and try and make an example that exercises both the dashed lines and the vectors in one plot?

[astrofrog]

could you clarify this comment? can this be removed?

[astrofrog]

Looks good to me, let's merge this and we can do a visual test in a separate PR