Add Integer volume and non-null default value

[hoxbro]

I can see the video pane model uses an integer for volumen and have a default value of 100 when null is used.

import panel as pn
pn.extension()

video = pn.pane.Video('/home/shh/Downloads/sample-mp4-file-small.mp4', width=640, loop=True)
#pn.Row(video.controls(jslink=True), video)

video

sample-mp4-file-small.mp4

[codecov]

Codecov Report

Merging #4970 (e2ae8a0) into main (2ab34b3) will decrease coverage by 2.66%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #4970      +/-   ##
==========================================
- Coverage   83.49%   80.83%   -2.66%     
==========================================
  Files         270      271       +1     
  Lines       38239    38253      +14     
==========================================
- Hits        31926    30923    -1003     
- Misses       6313     7330    +1017     

Flag	Coverage Δ
ui-tests	40.87% <100.00%> (-0.01%)	⬇️
unitexamples-tests	70.79% <100.00%> (-2.65%)	⬇️

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Impacted Files	Coverage Δ
panel/pane/media.py	92.23% <100.00%> (+0.07%)	⬆️

... and 24 files with indirect coverage changes

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[philippjfr]

Looks good!