feat: add event stream support

[adrums86]

Description

~Note: This is marked as a draft until the mpd-parser changes are integrated.~ See EventStream PR to mpd-parser: https://github.com/videojs/mpd-parser/pull/170

This pull request will take the parsed EventStream data and convert it into a id3-like object which can be added to the metadata text track for use as timed metadata.

Specific Changes proposed

Taking the EventStream data from the parsed manifest produced in the handleMain function in the dash-playlist-loader then adding it to the timed metadata text-track via the addMetadata function.

Requirements Checklist

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

[codecov[bot]]

Codecov Report

Merging #1382 (421adde) into main (6bd98d0) will increase coverage by 0.03%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1382      +/-   ##
==========================================
+ Coverage   85.37%   85.40%   +0.03%     
==========================================
  Files          40       40              
  Lines        9954     9963       +9     
  Branches     2308     2308              
==========================================
+ Hits         8498     8509      +11     
+ Misses       1456     1454       -2     

Impacted Files	Coverage Δ
src/dash-playlist-loader.js	90.51% <100.00%> (+0.18%)	:arrow_up:
src/playlist-controller.js	95.16% <100.00%> (+0.03%)	:arrow_up:
src/segment-loader.js	96.46% <100.00%> (+0.08%)	:arrow_up:

... and 1 file with indirect coverage changes

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[adrums86]

@dzianis-dashkevich and @wseymour15 I pushed the refactor, I would appreciate another look at the PR when you have time. Thanks!

[wseymour15]

@dzianis-dashkevich and @wseymour15 I pushed the refactor, I would appreciate another look at the PR when you have time. Thanks!

Looks good to me!