EN: Improved movie playback support using ffpyplayer

[mdcutone]

This PR adds the MovieFileReader class which will be used to replace the existing ffpyplayer backend used by MovieStim for playback. The new interface can also support other libraries in the future, providing a common interface for other backends, much like we did with MovieFileWriter.

[codecov]

Codecov Report

Merging #5914 (c9e7615) into dev (45b9fd3) will increase coverage by 31.01%.
Report is 6 commits behind head on dev.
The diff coverage is 20.96%.

❗ Current head c9e7615 differs from pull request most recent head 95550b0. Consider uploading reports for the commit 95550b0 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##              dev    #5914       +/-   ##
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+ Coverage   20.73%   51.75%   +31.01%     
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  Files         333      335        +2     
  Lines       60235    61961     +1726     
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+ Hits        12492    32067    +19575     
+ Misses      47743    29894    -17849     

Components	Coverage Δ
app	∅ <ø> (∅)
boilerplate	∅ <ø> (∅)
library	∅ <ø> (∅)
vm-safe library	∅ <ø> (∅)