feat: set up required key sessions on waitingforkey event

[gesinger]

If a waitingforkey event is fired, try to set up new key
sessions, as the manifest may have new key information.

Requirements Checklist

• Feature implemented / Bug fixed
• If necessary, more likely in a feature request than a bug fix
  • Unit Tests updated or fixed
  • Docs/guides updated
  • Example created (starter template on JSBin)
• Reviewed by Two Core Contributors

[codecov]

Codecov Report

Merging #1232 (8eb7ede) into main (f109078) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1232      +/-   ##
==========================================
+ Coverage   86.30%   86.31%   +0.01%     
==========================================
  Files          39       39              
  Lines        9797     9807      +10     
  Branches     2278     2279       +1     
==========================================
+ Hits         8455     8465      +10     
  Misses       1342     1342              

Impacted Files	Coverage Δ
src/videojs-http-streaming.js	91.02% <100.00%> (+0.20%)	⬆️

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[gkatsev]

tested