Add properties to cell and column attributes to expose constructor arguments

[jonsagara]

As discussed here, I added properties to attributes that control cells and columns:

• CellFormatAttribute
• CellStyleAttribute
• CellValueConverterAttribute
• CellValueTruncateAttribute
• ColumnHeaderAttribute
• ColumnOrderAttribute
• ColumnWidthAttribute

For attributes that only had a single constructor, I made the property nullability match nullability of the parameters.

For attributes that have multiple constructors, I made the properties nullable.

I also added corresponding unit tests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.00%. Comparing base (bb12192) to head (80fe5b0).
Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #84      +/-   ##
==========================================
+ Coverage   89.96%   90.00%   +0.03%     
==========================================
  Files         152      152              
  Lines        5450     5450              
  Branches     1020     1017       -3     
==========================================
+ Hits         4903     4905       +2     
  Misses        211      211              
+ Partials      336      334       -2     

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[sveinungf]

Looks very good! Thanks!