Ensure Tabulator.style applies correctly with changing data

[philippjfr]

The Tabulator.style.background_gradient and Tabulator.style.bar methods keep track of the columns that it can apply these styling options too, which means that if the data changes the styles will no longer correctly apply. Therefore we introduce a utility that will update the boolean index of column inside the Styler._todo list.

• Add tests

[codecov]

Codecov Report

Merging #5757 (3157237) into main (6640c83) will increase coverage by 0.03%.
Report is 1 commits behind head on main.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##             main    #5757      +/-   ##
==========================================
+ Coverage   73.66%   73.69%   +0.03%     
==========================================
  Files         289      289              
  Lines       42113    42135      +22     
==========================================
+ Hits        31021    31050      +29     
+ Misses      11092    11085       -7     

Flag	Coverage Δ
unitexamples-tests	73.69% <75.00%> (+0.03%)	⬆️

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

Files	Coverage Δ
panel/widgets/tables.py	87.55% <60.00%> (-0.15%)	⬇️
panel/util/__init__.py	83.00% <78.94%> (-0.27%)	⬇️

... and 4 files with indirect coverage changes

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