Add static RTP PayloadTypes as a constant

[Sean-Der]

Defined in IANA [0]

[0] https://www.iana.org/assignments/rtp-parameters/rtp-parameters.xhtml

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.50%. Comparing base (c52c1e7) to head (0e457ec).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #252   +/-   ##
=======================================
  Coverage   87.50%   87.50%           
=======================================
  Files          21       21           
  Lines        2129     2129           
=======================================
  Hits         1863     1863           
  Misses        230      230           
  Partials       36       36           

Flag	Coverage Δ
go	87.50% <ø> (ø)
wasm	86.98% <ø> (ø)

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