refactor: remove internal Map, Set, and WeakMap shams, assume window.performance and requestAnimationFrame support

[misteroneill]

Description

These are some additional updates and cleanup for a major version of Video.js.

Specific Changes proposed

• Remove internal Map, Set, and WeakMap shams (assume support for these classes)
• Remove a stray use of options_.Promise that carried over from main during a rebase
• Assume support for window.performance and window.performance.now()
• Assume support for requestAnimationFrame
• Remove remaining uses of extend() and replace with class instead (except for extend() tests)

Requirements Checklist

• Feature implemented / Bug fixed
• If necessary, more likely in a feature request than a bug fix
  • Change has been verified in an actual browser (Chrome, Firefox, IE)
  • Unit Tests updated or fixed
• Reviewed by Two Core Contributors

[codecov]

Codecov Report

Merging #7775 (e124304) into next (337a2a0) will increase coverage by 0.54%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##             next    #7775      +/-   ##
==========================================
+ Coverage   81.05%   81.59%   +0.54%     
==========================================
  Files         113      110       -3     
  Lines        7441     7358      -83     
  Branches     1802     1777      -25     
==========================================
- Hits         6031     6004      -27     
+ Misses       1410     1354      -56     

Impacted Files	Coverage Δ
src/js/component.js	94.11% <ø> (-0.08%)	⬇️
src/js/player.js	88.82% <86.66%> (+0.07%)	⬆️
src/js/tech/html5.js	66.94% <100.00%> (-0.28%)	⬇️
src/js/tracks/text-track.js	92.94% <0.00%> (+0.64%)	⬆️

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