Added direction to player

[hoxbro]

Exposing the direction parameter. xref https://discourse.holoviz.org/t/state-of-player-widget/3133

[codecov]

Codecov Report

Merging #2970 (08c84d6) into master (e79a7b2) will increase coverage by 0.09%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2970      +/-   ##
==========================================
+ Coverage   83.02%   83.12%   +0.09%     
==========================================
  Files         190      190              
  Lines       24737    24954     +217     
==========================================
+ Hits        20538    20742     +204     
- Misses       4199     4212      +13     

Impacted Files	Coverage Δ
panel/widgets/player.py	83.05% <100.00%> (+0.29%)	⬆️
panel/models/vega.py	88.00% <0.00%> (-6.12%)	⬇️
panel/param.py	86.92% <0.00%> (-0.82%)	⬇️
panel/io/save.py	62.60% <0.00%> (-0.33%)	⬇️
panel/pane/image.py	80.50% <0.00%> (-0.23%)	⬇️
panel/auth.py	40.62% <0.00%> (-0.18%)	⬇️
panel/pane/plot.py	59.58% <0.00%> (-0.11%)	⬇️
panel/io/callbacks.py	66.66% <0.00%> (ø)
panel/models/layout.py	100.00% <0.00%> (ø)
panel/tests/test_util.py	100.00% <0.00%> (ø)
... and 13 more

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