Lazily load Tabulator widget

[philippjfr]

Fixes #2284

[codecov]

Codecov Report

Merging #2364 (4c0481e) into master (9020634) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 4c0481e differs from pull request most recent head 068a3a1. Consider uploading reports for the commit 068a3a1 to get more accurate results

@@           Coverage Diff           @@
##           master    #2364   +/-   ##
=======================================
  Coverage   83.76%   83.77%           
=======================================
  Files         184      184           
  Lines       22453    22454    +1     
=======================================
+ Hits        18808    18811    +3     
+ Misses       3645     3643    -2     

Impacted Files	Coverage Δ
panel/config.py	59.19% <ø> (ø)
panel/models/__init__.py	100.00% <ø> (ø)
panel/widgets/tables.py	83.72% <100.00%> (+0.05%)	⬆️
panel/io/reload.py	66.66% <0.00%> (+2.29%)	⬆️

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