Finish AV1 Implementation

[JoeTurki]

Description

1. Rewrite the AV1 Payloader according to the spec.
2. AV1 bitstream reader.
3. Tries to optimize the use of the W field as much as possible to reduce the size of the packet.
4. Added tests around edge cases.
5. Deprecate AV1Packet as it has no use, and too late to change.

Tested and works as intended. I'll update the examples in the WebRTC repo accordingly.

Reference issue

pion/webrtc#3036
pion/webrtc#2788
#273
pion/webrtc#2639

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.69%. Comparing base (061df8a) to head (ee5524b).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #295      +/-   ##
==========================================
+ Coverage   85.99%   86.69%   +0.69%     
==========================================
  Files          26       26              
  Lines        2913     3043     +130     
==========================================
+ Hits         2505     2638     +133     
+ Misses        350      348       -2     
+ Partials       58       57       -1     

Flag	Coverage Δ
go	86.69% <100.00%> (+0.69%)	⬆️
wasm	86.13% <100.00%> (+0.72%)	⬆️

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[JoeTurki]

@Sean-Der I can confirm that this is working with chrome and gstreamer

[JoeTurki]

Thanks, I'll test it a bit more with bigger files and real video data and merge it tonight :)

[Sean-Der]

@JoeTurki you are a better tester/more detail oriented then me :)

Thanks for doing this. This is going to help a lot of people building cool stuff. I am very excited for you to get the credit/attention for it!