Set default alignment for Tabulator

[philippjfr]

Copies the default alignment for different types from Excel.

Fixes #3186

[codecov]

Codecov Report

Merging #3194 (bf5eef7) into master (b04aa15) will increase coverage by 0.00%.
The diff coverage is 83.33%.

@@           Coverage Diff           @@
##           master    #3194   +/-   ##
=======================================
  Coverage   82.99%   82.99%           
=======================================
  Files         193      193           
  Lines       25624    25626    +2     
=======================================
+ Hits        21266    21268    +2     
  Misses       4358     4358           

Impacted Files	Coverage Δ
panel/widgets/tables.py	84.81% <83.33%> (+0.03%)	⬆️

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