feat: add compatibility layer for video.js 7 and 8

[misteroneill]

Description

There will be a few functions in Video.js deprecated in 8.0 including videojs.mergeOptions and videojs.createTimeRanges. Both functions still work, but will log a deprecation warning. We do not want to log deprecation warnings out of the box, so with this PR we call the new methods via a small utility module, vjs-compat.

Tested with both Video.js 7.x and Video.js next branch.

Specific Changes proposed

• Add util/vjs-compat with two functions:
• merge, which delegates to videojs.obj.merge, falling back to videojs.mergeOptions
• createTimeRanges, which delegates to videojs.time.createTimeRanges, falling back to videojs.createTimeRanges
• Removes old Video.js 4.x-style plugin registration via videojs.plugin()
• Updates dev dependency, videojs-contrib-eme, so that it will not log deprecation warnings in tests.

Requirements Checklist

• Feature implemented / Bug fixed
• Reviewed by Two Core Contributors

[codecov]

Codecov Report

Merging #1322 (0822e79) into next (8954a40) will increase coverage by 0.00%.
The diff coverage is 92.45%.

@@           Coverage Diff           @@
##             next    #1322   +/-   ##
=======================================
  Coverage   85.97%   85.98%           
=======================================
  Files          39       40    +1     
  Lines        9820     9826    +6     
  Branches     2286     2289    +3     
=======================================
+ Hits         8443     8449    +6     
  Misses       1377     1377           

Impacted Files	Coverage Δ
src/source-updater.js	94.19% <50.00%> (ø)
src/playlist-loader.js	95.00% <80.00%> (ø)
src/media-segment-request.js	95.40% <83.33%> (ø)
src/dash-playlist-loader.js	90.05% <100.00%> (ø)
src/media-groups.js	98.66% <100.00%> (ø)
src/playlist-controller.js	94.98% <100.00%> (ø)
src/playlist.js	94.53% <100.00%> (-0.03%)	⬇️
src/ranges.js	99.34% <100.00%> (ø)
src/reload-source-on-error.js	97.72% <100.00%> (ø)
src/segment-loader.js	96.37% <100.00%> (ø)
... and 4 more

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