support publishing with WebRTC (#1659)

[aler9]

Fixes #1659

[codecov-commenter]

Codecov Report

Merging #1786 (1685fbb) into main (6ea299f) will decrease coverage by 2.27%.
The diff coverage is 35.32%.

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@@            Coverage Diff             @@
##             main    #1786      +/-   ##
==========================================
- Coverage   62.27%   60.01%   -2.27%     
==========================================
  Files         101      105       +4     
  Lines       10147    10606     +459     
==========================================
+ Hits         6319     6365      +46     
- Misses       3385     3794     +409     
- Partials      443      447       +4     

Impacted Files	Coverage Δ
internal/core/path.go	72.05% <ø> (-0.33%)	⬇️
internal/core/rpicamera_source.go	0.00% <0.00%> (ø)
internal/core/source.go	100.00% <ø> (ø)
internal/core/source_redirect.go	0.00% <0.00%> (ø)
internal/core/udp_source.go	0.00% <0.00%> (ø)
internal/core/webrtc_incoming_track.go	0.00% <0.00%> (ø)
internal/formatprocessor/av1.go	0.00% <0.00%> (ø)
internal/formatprocessor/generic.go	46.66% <0.00%> (-9.34%)	⬇️
internal/formatprocessor/mpeg2audio.go	0.00% <0.00%> (ø)
internal/formatprocessor/mpeg4audio.go	0.00% <0.00%> (ø)
... and 21 more

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