Add ICE UDPMuxSrflx option

[kevindejong]

Description

Adds an UDPMuxSrflx option to the setting engine for ICE agent config.

[codecov]

Codecov Report

Base: 77.34% // Head: 77.25% // Decreases project coverage by -0.08% ⚠️

Coverage data is based on head (3c5b9fa) compared to base (4e85358).
Patch coverage: 11.11% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2298      +/-   ##
==========================================
- Coverage   77.34%   77.25%   -0.09%     
==========================================
  Files          87       87              
  Lines        9197     9206       +9     
==========================================
- Hits         7113     7112       -1     
- Misses       1651     1661      +10     
  Partials      433      433              

Flag	Coverage Δ
go	79.01% <11.11%> (-0.10%)	⬇️
wasm	70.03% <0.00%> (-0.13%)	⬇️

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Impacted Files	Coverage Δ
icemux.go	35.29% <0.00%> (-19.26%)	⬇️
settingengine.go	57.14% <0.00%> (-1.40%)	⬇️
icegatherer.go	79.56% <100.00%> (+0.07%)	⬆️
internal/mux/mux.go	84.78% <0.00%> (-4.35%)	⬇️
sctptransport.go	77.90% <0.00%> (+0.74%)	⬆️

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[stv0g]

LGTM. Can you please fix the CI by adjusting the commit message?

The CI linter requires that you have a body in the commit message separated by an empty line from the title.

Have a look at other commits in this repo for reference.