feat: Allow ref callback for Chart and ChartPanel

[mattrunyon]

Needed for deephaven/deephaven-plugins#657 because when using ChartPanel containerRef is undefined on first render due to the loading logic. This means we need to allow a ref callback so we can use a callback to set state in the plugin and add event listeners to the container when it actually exists

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 4 lines in your changes missing coverage. Please review.

Project coverage is 46.67%. Comparing base (a5cb947) to head (8b3ca50).
Report is 4 commits behind head on main.

Files	Patch %	Lines
packages/chart/src/Chart.tsx	0.00%	2 Missing ⚠️
...ages/components/src/spectrum/comboBox/ComboBox.tsx	0.00%	1 Missing ⚠️
packages/components/src/spectrum/picker/Picker.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2174   +/-   ##
=======================================
  Coverage   46.67%   46.67%           
=======================================
  Files         692      692           
  Lines       38628    38624    -4     
  Branches     9631     9625    -6     
=======================================
  Hits        18028    18028           
+ Misses      20589    20585    -4     
  Partials       11       11           

Flag	Coverage Δ
unit	46.67% <71.42%> (+<0.01%)	⬆️

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