Copy media packages from webrtc/pkg/media

[JoTurk]

Description

closes #6 after this I'll do cleanups, move to options patterns (some of the packages have mixed options), export more helpers, restructure a bit.

[codecov]

Codecov Report

❌ Patch coverage is 87.32203% with 187 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.69%. Comparing base (cc08bd8) to head (fbc8d97).

Files with missing lines	Patch %	Lines
h265reader/nalunittype.go	0.00%	33 Missing ⚠️
oggwriter/oggwriter.go	94.50%	32 Missing ⚠️
ivfwriter/ivfwriter.go	81.70%	30 Missing ⚠️
h264reader/nalunittype.go	0.00%	20 Missing ⚠️
h265reader/h265reader.go	88.99%	12 Missing ⚠️
h265writer/h265writer.go	80.00%	11 Missing ⚠️
h264reader/h264reader.go	89.89%	10 Missing ⚠️
ivfreader/ivfreader.go	85.96%	8 Missing ⚠️
rtpdump/reader.go	84.00%	8 Missing ⚠️
oggreader/oggreader.go	96.35%	7 Missing ⚠️
... and 3 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #7      +/-   ##
==========================================
- Coverage   88.67%   87.69%   -0.98%     
==========================================
  Files          11       25      +14     
  Lines         565     2040    +1475     
==========================================
+ Hits          501     1789    +1288     
- Misses         64      251     +187     

Flag	Coverage Δ
go	87.69% <87.32%> (-0.98%)	⬇️

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