paginate_table - fill_empty - NA available and coerce to char

[Polkas]

paginate_table has an option for fill_empty with NA now.
For a character fill_empty the last table is coerce to a character columns.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.57%. Comparing base (9cce88f) to head (a825596).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #21   +/-   ##
=======================================
  Coverage   99.56%   99.57%           
=======================================
  Files           9        9           
  Lines         919      936   +17     
=======================================
+ Hits          915      932   +17     
  Misses          4        4           

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