webrtc: improve connectivity mechanism

[aler9]

• add webrtcAdditionalHosts and allow to use DNS names in place of IPs
• always use a fixed UDP port
• allow to disable UDP
• do not use a STUN server by default

[codecov]

Codecov Report

Merging #2686 (5c6e445) into main (4cf8948) will decrease coverage by 0.13%.
Report is 1 commits behind head on main.
The diff coverage is 58.46%.

@@            Coverage Diff             @@
##             main    #2686      +/-   ##
==========================================
- Coverage   59.53%   59.41%   -0.13%     
==========================================
  Files         144      144              
  Lines       15291    15315      +24     
==========================================
- Hits         9104     9099       -5     
- Misses       5548     5575      +27     
- Partials      639      641       +2     

Files	Coverage Δ
internal/conf/encryption.go	26.66% <ø> (ø)
internal/core/path.go	64.06% <ø> (+0.23%)	⬆️
internal/core/core.go	85.67% <96.42%> (-0.07%)	⬇️
internal/protocols/webrtc/whip_client.go	0.00% <0.00%> (ø)
internal/core/webrtc_manager.go	62.86% <82.00%> (-0.46%)	⬇️
internal/conf/conf.go	62.57% <33.33%> (-2.61%)	⬇️
internal/protocols/webrtc/api.go	0.00% <0.00%> (ø)

... and 3 files with indirect coverage changes

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[github-actions]

This issue is mentioned in release v1.3.0 🚀
Check out the entire changelog by clicking here