feat: View cell contents in context menu

[dsmmcken]

Resolves #1605

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (6083173) 46.58% compared to head (f6614c6) 46.58%.

Files	Patch %	Lines
...d/src/mousehandlers/IrisGridContextMenuHandler.tsx	25.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1657      +/-   ##
==========================================
- Coverage   46.58%   46.58%   -0.01%     
==========================================
  Files         597      597              
  Lines       36525    36529       +4     
  Branches     9144     9144              
==========================================
+ Hits        17015    17016       +1     
- Misses      19458    19461       +3     
  Partials       52       52              

Flag	Coverage Δ
unit	46.58% <25.00%> (-0.01%)	⬇️

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[mofojed]

Looks good.

The signature for getCellActions could be improved (modelColumn can't be null/undefined, it's not even using grid, and it gets the modelRow again even though it's only called from a spot where we already know modelRow is not null), but none of that is part of your change.