feat: allow media engine to register custom payloader on mimetype

[LeeTeng2001]

Description

Allow media engine to register custom payloader depending on the mime type

Reference issue

Fixes #2928

[Sean-Der]

Looks great @LeeTeng2001!

• Can you put it on the MediaEngine. That way users can configure per PeerConnection (or globally) if they want
• Would it be possible to assert that Payload actually gets called?

[LeeTeng2001]

@Sean-Der just to clarify, should I put it in both MediaEngine and global scope so that we ca either register it through global scope and media engine scope?

[LeeTeng2001]

hi, I've updated a pr with payload assert and MediaEngine custom payloader scope

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.97%. Comparing base (8fbf821) to head (8d4c57c).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2931      +/-   ##
==========================================
- Coverage   78.99%   78.97%   -0.03%     
==========================================
  Files          89       89              
  Lines        8573     8579       +6     
==========================================
+ Hits         6772     6775       +3     
- Misses       1311     1313       +2     
- Partials      490      491       +1     

Flag	Coverage Δ
go	80.51% <100.00%> (-0.03%)	⬇️
wasm	63.80% <ø> (ø)

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