Implement Tabulator.on_edit callbacks

[philippjfr]

In many applications it is important to know which specific cell was updated, e.g. so you can make an atomic update to a database without having to sync the entire table.

[codecov]

Codecov Report

Merging #2887 (516c7ce) into master (3591f07) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2887      +/-   ##
==========================================
+ Coverage   83.04%   83.06%   +0.02%     
==========================================
  Files         190      190              
  Lines       24561    24599      +38     
==========================================
+ Hits        20396    20433      +37     
- Misses       4165     4166       +1     

Impacted Files	Coverage Δ
panel/models/tabulator.py	98.76% <100.00%> (+4.24%)	⬆️
panel/tests/widgets/test_tables.py	99.46% <100.00%> (+0.01%)	⬆️
panel/widgets/tables.py	85.15% <100.00%> (+0.14%)	⬆️
panel/io/reload.py	68.88% <0.00%> (-2.23%)	⬇️
panel/tests/command/test_serve.py	83.54% <0.00%> (-1.46%)	⬇️
panel/reactive.py	75.00% <0.00%> (+0.03%)	⬆️
panel/models/plotly.py	96.66% <0.00%> (+0.11%)	⬆️
panel/pane/idom.py	27.40% <0.00%> (+0.20%)	⬆️
panel/layout/tabs.py	86.73% <0.00%> (+0.27%)	⬆️

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