[Feature] Docker port mapping

[alexhu-oai]

Allows us to specify ports that will be mapped for gathered local host candidates. We do so whenever we create an Agent. Useful for docker.

[codecov]

Codecov Report

Attention: Patch coverage is 89.36170% with 5 lines in your changes missing coverage. Please review.

Project coverage is 79.11%. Comparing base (2c04474) to head (e762598).

Files with missing lines	Patch %	Lines
agent.go	0.00%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #790      +/-   ##
==========================================
+ Coverage   78.74%   79.11%   +0.37%     
==========================================
  Files          41       42       +1     
  Lines        5480     5525      +45     
==========================================
+ Hits         4315     4371      +56     
+ Misses        935      923      -12     
- Partials      230      231       +1     

Flag	Coverage Δ
go	79.11% <89.36%> (+0.37%)	⬆️
wasm	27.27% <70.21%> (+0.37%)	⬆️

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