Implement disabled parameter for editable sliders

[philippjfr]

Fixes #5318

[codecov]

Codecov Report

Merging #5319 (73ac959) into main (b3faebc) will decrease coverage by 49.10%.
The diff coverage is 27.58%.

❗ Current head 73ac959 differs from pull request most recent head 2dd4741. Consider uploading reports for the commit 2dd4741 to get more accurate results

@@             Coverage Diff             @@
##             main    #5319       +/-   ##
===========================================
- Coverage   72.85%   23.75%   -49.10%     
===========================================
  Files         274      274               
  Lines       39708    39732       +24     
===========================================
- Hits        28928     9440    -19488     
- Misses      10780    30292    +19512     

Flag	Coverage Δ
unitexamples-tests	23.75% <27.58%> (-49.10%)	⬇️

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Files Changed	Coverage Δ
panel/tests/widgets/test_slider.py	8.84% <12.50%> (-90.22%)	⬇️
panel/widgets/slider.py	32.94% <46.15%> (-61.52%)	⬇️

... and 175 files with indirect coverage changes

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