feat: Add check for ManagedMediaSource support

[mister-ben]

Adds, optionally, a check for codec support by ManagedMediaSource in browserSupportsCodec().

VHS will not register itself as a source handler unless this returns true. Currently this is a test against MediaSource only. The new optional check allows this to work on new iOS on iPhones, which supports ManagedMediaSource but not MediaSource. The check is optional so that VHS would be able to choose whether to check for support, so playback with ManagedMediaSource can be made optional there, and this also retains backwards compatibility.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (88d6e10) 87.54% compared to head (c24d4a3) 87.60%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #37      +/-   ##
==========================================
+ Coverage   87.54%   87.60%   +0.05%     
==========================================
  Files          18       18              
  Lines        1277     1283       +6     
  Branches      336      342       +6     
==========================================
+ Hits         1118     1124       +6     
  Misses        159      159              

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