fix: Use virtual-webgl to circumvent browser limits on WebGL contexts

[mofojed]

• Browsers often have a restriction on the number of WebGL contexts that can be created
  • e.g. Chrome on MacOS has a limit of 8
• Use virtual-webgl to circumvent that limit. Basically it creates one context that is used for the whole page.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 562 lines in your changes missing coverage. Please review.

Project coverage is 46.09%. Comparing base (680f015) to head (fe32d3e).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/chart/src/virtual-webgl.ts	0.00%	559 Missing and 2 partials ⚠️
packages/chart/src/index.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2349      +/-   ##
==========================================
- Coverage   46.76%   46.09%   -0.67%     
==========================================
  Files         710      712       +2     
  Lines       39107    39671     +564     
  Branches     9773    10055     +282     
==========================================
  Hits        18288    18288              
- Misses      20808    21327     +519     
- Partials       11       56      +45     

Flag	Coverage Δ
unit	46.09% <0.00%> (-0.67%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[mattrunyon]

Should we add an e2e test for this?

[mofojed]

Should we add an e2e test for this?

e2e test kind of annoying because don't have deephaven.ui in the e2e tests here so can't define the dashboard programmatically, and adding 16 plots and moving them all to be visible cycling through them will be annoyingly slow/difficult to write robustly... Hmmmmm actually I just realized I could define all the plots programmatically and then create a layout with all those plots, and have that in the data. That wouldn't be too bad...