Add DatetimeRangeSlider

[philippjfr]

This was added in bokeh 2.4.3

[codecov]

Codecov Report

Merging #3548 (8b56f2b) into master (c00f5c1) will decrease coverage by 0.01%.
The diff coverage is 77.77%.

❗ Current head 8b56f2b differs from pull request most recent head d13e718. Consider uploading reports for the commit d13e718 to get more accurate results

@@            Coverage Diff             @@
##           master    #3548      +/-   ##
==========================================
- Coverage   82.77%   82.75%   -0.02%     
==========================================
  Files         199      199              
  Lines       27424    27426       +2     
==========================================
- Hits        22699    22697       -2     
- Misses       4725     4729       +4     

Impacted Files	Coverage Δ
panel/widgets/slider.py	84.19% <75.00%> (-0.16%)	⬇️
panel/widgets/__init__.py	100.00% <100.00%> (ø)
panel/io/reload.py	69.56% <0.00%> (-2.18%)	⬇️
panel/tests/command/test_serve.py	83.54% <0.00%> (-1.46%)	⬇️
panel/io/state.py	67.02% <0.00%> (-0.22%)	⬇️
panel/io/server.py	76.35% <0.00%> (-0.21%)	⬇️
panel/pane/idom.py	27.40% <0.00%> (+0.20%)	⬆️
panel/io/callbacks.py	75.38% <0.00%> (+0.57%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c00f5c1...d13e718. Read the comment docs.