Update how the SDK parses NGINX API server directive

[dhurley]

Proposed changes

Updated parseAddressesFromServerDirective function to return multiple possible addresses.
See here for more info on the listen directive http://nginx.org/en/docs/http/ngx_http_core_module.html#listen

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13

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[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.08% ⚠️

Comparison is base (996d150) 67.57% compared to head (82fc344) 67.49%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #423      +/-   ##
==========================================
- Coverage   67.57%   67.49%   -0.08%     
==========================================
  Files         113      113              
  Lines       12766    12778      +12     
==========================================
- Hits         8627     8625       -2     
- Misses       3569     3584      +15     
+ Partials      570      569       -1     

Files Changed	Coverage Δ
...or/github.com/nginx/agent/sdk/v2/config_helpers.go	68.89% <100.00%> (+0.56%)	⬆️

... and 2 files with indirect coverage changes

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