feat: Assume DASH MIME type when an MPD source URL is given

[amtins]

Description

Since http-streaming plays DASH, adding this feature will allow a DASH source to be provided without necessarily indicating the media type.

player.src('https://domain.com/video.mpd') //👌

Specific Changes proposed

• Add application/dash+xml to the MimetypesKind object
• Update old unavailable link listing different mime types

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)
• Reviewed by Two Core Contributors

[codecov]

Codecov Report

Merging #7602 (5b6d32a) into main (eeda26f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #7602   +/-   ##
=======================================
  Coverage   80.24%   80.24%           
=======================================
  Files         116      116           
  Lines        7325     7325           
  Branches     1771     1771           
=======================================
  Hits         5878     5878           
  Misses       1447     1447           

Impacted Files	Coverage Δ
src/js/utils/mimetypes.js	72.00% <ø> (ø)

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[misteroneill]

Seems sensible to me!