[ATS-854] Add media tracks to player from webvtt rendition

[pmartinezga]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x")

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation
• Other... Please describe:

What is the current behaviour? (You can also link to an open issue here)
https://alfresco.atlassian.net/browse/ATS-854

What is the new behaviour?
https://alfresco.atlassian.net/browse/ATS-854

Does this PR introduce a breaking change? (check one with "x")

• Yes
• No

If this PR contains a breaking change, please describe the impact and migration path for existing applications: ...

Other information:

[eromano]

should this thing be in adf-media-player ?

[pmartinezga]

We can do it here or in the media player. I decided to do it here and keep media without any logic to follow the same approach that has been done with the source url, that is not calculated in media player but here in the viewer.

I can do it as you prefer, @eromano media or viewer?

[eromano]

to me looks a media player concern and you are right in this class there are other concern to move

[codecov-io]

Codecov Report

Merging #6626 (2578de4) into develop (a133678) will increase coverage by 1.90%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #6626      +/-   ##
===========================================
+ Coverage    76.26%   78.17%   +1.90%     
===========================================
  Files          871      493     -378     
  Lines        19654    11558    -8096     
  Branches      3917     2200    -1717     
===========================================
- Hits         14990     9035    -5955     
+ Misses        3470     1827    -1643     
+ Partials      1194      696     -498     

Impacted Files	Coverage Δ
.../lib/task-list/components/task-header.component.ts	82.97% <0.00%> (-6.50%)	⬇️
.../lib/document-list/data/share-datatable-adapter.ts	69.92% <0.00%> (-2.05%)	⬇️
.../lib/search/search-header-query-builder.service.ts	73.46% <0.00%> (-1.54%)	⬇️
.../attach-file/attach-file-cloud-widget.component.ts	85.52% <0.00%> (-1.15%)	⬇️
...lib/task-list/components/task-details.component.ts	75.42% <0.00%> (-0.85%)	⬇️
...load/components/file-uploading-dialog.component.ts	89.33% <0.00%> (-0.67%)	⬇️
...-selector/content-node-selector-panel.component.ts	85.35% <0.00%> (-0.37%)	⬇️
...ocument-list/components/document-list.component.ts	81.90% <0.00%> (-0.31%)	⬇️
...vices/src/lib/search/base-query-builder.service.ts	84.28% <0.00%> (-0.23%)	⬇️
lib/core/viewer/components/pdf-viewer.component.ts
... and 378 more

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