Add support to AV1 in play-from-disk

[Sean-Der]

Resolves pion/rtp#190
Resolves pion/rtp#191

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.09 ⚠️

Comparison is base (24b241a) 77.65% compared to head (8642fc4) 77.56%.

❗ Current head 8642fc4 differs from pull request most recent head 38fd93f. Consider uploading reports for the commit 38fd93f to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2515      +/-   ##
==========================================
- Coverage   77.65%   77.56%   -0.09%     
==========================================
  Files          87       87              
  Lines        9348     9357       +9     
==========================================
- Hits         7259     7258       -1     
- Misses       1656     1666      +10     
  Partials      433      433              

Flag	Coverage Δ
go	79.32% <100.00%> (-0.10%)	⬇️
wasm	70.15% <ø> (ø)

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Impacted Files	Coverage Δ
mediaengine.go	91.95% <100.00%> (+0.16%)	⬆️

... and 3 files with indirect coverage changes

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