Factor out logic for inferring widget from abbreviation

[philippjfr]

Fixes #1826

[codecov]

Codecov Report

Merging #3589 (6c98032) into master (aed60e9) will increase coverage by 0.48%.
The diff coverage is 83.21%.

❗ Current head 6c98032 differs from pull request most recent head 69579e0. Consider uploading reports for the commit 69579e0 to get more accurate results

@@            Coverage Diff             @@
##           master    #3589      +/-   ##
==========================================
+ Coverage   82.36%   82.84%   +0.48%     
==========================================
  Files         204      200       -4     
  Lines       27864    27521     -343     
==========================================
- Hits        22950    22801     -149     
+ Misses       4914     4720     -194     

Impacted Files	Coverage Δ
panel/widgets/widget.py	82.67% <82.67%> (ø)
panel/interact.py	72.18% <85.71%> (-2.31%)	⬇️
panel/__init__.py	100.00% <100.00%> (ø)
panel/widgets/__init__.py	100.00% <100.00%> (ø)
panel/pane/plot.py	58.58% <0.00%> (-2.27%)	⬇️
panel/pane/image.py	80.09% <0.00%> (-1.68%)	⬇️
panel/layout/gridstack.py	52.54% <0.00%> (-1.56%)	⬇️
panel/tests/widgets/test_terminal.py	57.69% <0.00%> (-1.19%)	⬇️
panel/pane/idom.py	27.20% <0.00%> (-0.97%)	⬇️
panel/pane/equation.py	85.10% <0.00%> (-0.61%)	⬇️
... and 61 more

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[jbednar]

Cool! Would be nice to have one of the examples updated to use it.

[philippjfr]

Merging, will figure out how best to document this utility subsequently.