Add timeline view to admin dashboard

[philippjfr]

[codecov]

Codecov Report

Merging #2667 (d2f400b) into master (0380a8b) will decrease coverage by 0.38%.
The diff coverage is 20.73%.

@@            Coverage Diff             @@
##           master    #2667      +/-   ##
==========================================
- Coverage   82.18%   81.79%   -0.39%     
==========================================
  Files         186      187       +1     
  Lines       23682    23834     +152     
==========================================
+ Hits        19463    19496      +33     
- Misses       4219     4338     +119     

Impacted Files	Coverage Δ
panel/io/admin.py	0.00% <0.00%> (ø)
panel/io/profile.py	18.08% <ø> (ø)
panel/io/server.py	57.76% <33.33%> (-0.55%)	⬇️
panel/io/callbacks.py	67.70% <37.50%> (-2.75%)	⬇️
panel/io/state.py	65.57% <66.66%> (+0.14%)	⬆️
panel/config.py	58.94% <83.33%> (+0.49%)	⬆️
panel/io/__init__.py	91.66% <100.00%> (-4.49%)	⬇️
panel/io/logging.py	100.00% <100.00%> (ø)
panel/reactive.py	74.62% <100.00%> (+0.03%)	⬆️
panel/io/reload.py	66.29% <0.00%> (-2.25%)	⬇️
... and 7 more

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