feat: add class to normalise time control display

[mister-ben]

Description

Time controls continue to cause confusion as they are included by default but hidden by default. e.g. #8534 Adding CSS to display them is not intuitive.

Specific Changes proposed

Changing the default styles would be problematic before a major version. This PR proposes adding an optional vjs-normalise-time-controls class a user can add to the player, as an opt in.

This will default all time controls to being shown, except when live content is playing. Users would then have to remove the time controls in player options, or with hide() or dispose().

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
  • Docs/guides updated
  • Example created (starter template on JSBin)
  • Has no DOM changes which impact accessiblilty or trigger warnings (e.g. Chrome issues tab)
  • Has no changes to JSDoc which cause npm run docs:api to error
• Reviewed by Two Core Contributors

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.21%. Comparing base (8c56e31) to head (8f6b0a7).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8833   +/-   ##
=======================================
  Coverage   83.21%   83.21%           
=======================================
  Files         120      120           
  Lines        8066     8066           
  Branches     1937     1937           
=======================================
  Hits         6712     6712           
  Misses       1354     1354           

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[adrums86]

Merging this for the next release.