Add support for symmetric RTP

[GianlucaP106]

Introduce a SymmetricRTP config flag and wire it into inbound/outbound media setup. When enabled, the media port updates its RTP destination to the latest packet source address. Issue #611

[CLAassistant]

All committers have signed the CLA.

[GianlucaP106]

Happy to iterate if there are issues.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.01%. Comparing base (0460b40) to head (54b228d).
⚠️ Report is 253 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #624      +/-   ##
==========================================
- Coverage   65.25%   64.01%   -1.25%     
==========================================
  Files          51       35      -16     
  Lines        6588     7011     +423     
==========================================
+ Hits         4299     4488     +189     
- Misses       1915     2104     +189     
- Partials      374      419      +45     

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