fix: Interface for IrisGridTableModelTemplate.backgroundColorForCell

[mofojed]

• The implementation for IrisGridTableModelTemplate.backgroundColorForCell did not accept a theme, even though GridModel.backgroundColorForCell does
• This caused issues with classes that extended IrisGridTableModelTemplate or it's subclasses like IrisGridTableModel, as the could not override this method to correctly accept the theme parameter
• Also export all types from GridTheme - there were a few things not being exported (such as GridColor)
• Fixes Interface for IrisGridModelTableTemplate.backgroundColorForCell does not match GridModel.backgroundColorForCell #1697

BREAKING CHANGE:

• Subclasses of IrisGridTableModelTemplate or it's subclasses that use backgroundColorForCell may need to update their signature to accept the theme if they are calling the superclass

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (73e0b65) 46.67% compared to head (89ae4f3) 46.67%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1699   +/-   ##
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  Coverage   46.67%   46.67%           
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  Files         606      606           
  Lines       36873    36873           
  Branches     9267     9267           
=======================================
  Hits        17211    17211           
  Misses      19610    19610           
  Partials       52       52           

Flag	Coverage Δ
unit	46.67% <100.00%> (ø)

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