Sorting number rather than string in tabulators

[liu-kan]

Tabulator JS has its Built In Sorters for data other than string.
Default behaviours for sorting data, include numbers, in panel tabulator, is treating them as string.
This PR fix this issue.

[codecov]

Codecov Report

Merging #3999 (9dfd0c3) into master (a7f880f) will decrease coverage by 8.96%.
The diff coverage is 63.33%.

@@            Coverage Diff             @@
##           master    #3999      +/-   ##
==========================================
- Coverage   83.67%   74.71%   -8.97%     
==========================================
  Files         223      223              
  Lines       33048    33104      +56     
==========================================
- Hits        27654    24734    -2920     
- Misses       5394     8370    +2976     

Flag	Coverage Δ
ui-tests	?
unitexamples-tests	74.71% <63.33%> (-0.13%)	⬇️

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

Impacted Files	Coverage Δ
panel/tests/ui/widgets/test_tabulator.py	9.50% <8.33%> (-89.46%)	⬇️
panel/tests/widgets/test_tables.py	99.66% <100.00%> (+<0.01%)	⬆️
panel/widgets/tables.py	87.36% <100.00%> (-1.05%)	⬇️
panel/tests/ui/widgets/test_input.py	11.34% <0.00%> (-88.08%)	⬇️
panel/tests/ui/layout/test_accordion.py	14.72% <0.00%> (-85.28%)	⬇️
panel/tests/ui/widgets/test_sliders.py	15.42% <0.00%> (-84.58%)	⬇️
panel/tests/ui/layout/test_card.py	18.01% <0.00%> (-81.99%)	⬇️
panel/tests/ui/io/test_convert.py	16.66% <0.00%> (-78.71%)	⬇️
panel/tests/ui/test_reactive.py	26.53% <0.00%> (-73.47%)	⬇️
... and 34 more

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[maximlt]

This is the change I also found that was required to fix #3976, thanks a lot @liu-kan !!!