Add host_to_srflx_ip_mapper

[Karolk99]

Add host_to_sfrlx_ip_mapper ICE option.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.72%. Comparing base (83c99c8) to head (955dcb9).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #229      +/-   ##
==========================================
- Coverage   87.79%   87.72%   -0.07%     
==========================================
  Files          54       54              
  Lines        2752     2753       +1     
==========================================
- Hits         2416     2415       -1     
- Misses        336      338       +2     

Files with missing lines	Coverage Δ
lib/ex_webrtc/peer_connection.ex	85.25% <100.00%> (-0.24%)	⬇️
lib/ex_webrtc/peer_connection/configuration.ex	95.05% <ø> (ø)

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