WIP: Lines for table layers

[Carifio24]

The goal of this PR is to implement a feature request from Alyssa, which is to have the ability to join points in a table layer with a line. This is done via the add_line functionality from the WWT client (JS-side, this uses WWT's PolyLine annotation).

There are a few outstanding issues:

• This doesn't yet work in the Milky Way mode
• The opacity of the lines is currently always 1. This is due to a WWT bug which was fixed upstream in Respect opacity when drawing annotations WorldWideTelescope/wwt-webgl-engine#238 but hasn't yet propagated down to pywwt.
• The lines are added one at a time. This is usually not an issue since it happens quickly, but can become noticeable with a large number of points. If you play the video below at a slower speed (or just scrub to an appropriate frame), this can be seen. I think this is due to the fact that we can only add one line to the annotation at a time. I don't think this is as critical as the opacity, but is something I can look into.

TableLines.mov

[codecov]

Codecov Report

Patch coverage: 56.00% and project coverage change: -0.47 ⚠️

Comparison is base (02379d0) 71.55% compared to head (76f8440) 71.09%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #96      +/-   ##
==========================================
- Coverage   71.55%   71.09%   -0.47%     
==========================================
  Files          18       18              
  Lines         872      896      +24     
==========================================
+ Hits          624      637      +13     
- Misses        248      259      +11     

Impacted Files	Coverage Δ
glue_wwt/viewer/table_layer.py	74.72% <56.00%> (-2.02%)	⬇️

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