[CODE HEALTH] Use uint16_t for port numbers in ext/http/server

[marcalff]

Fixes #4305

Changes

Please provide a brief description of the changes here.

• Code cleanup, use uint16_t for port numbers, in ext/http/server

For significant contributions please make sure you have completed the following items:

• CHANGELOG.md updated for non-trivial changes
• Unit tests have been added
• Changes in public API reviewed

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.25%. Comparing base (e68171d) to head (5aafe79).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4500      +/-   ##
==========================================
+ Coverage   83.24%   83.25%   +0.01%     
==========================================
  Files         521      521              
  Lines       20384    20384              
==========================================
+ Hits        16967    16969       +2     
+ Misses       3417     3415       -2     

Files with missing lines	Coverage Δ
...nclude/opentelemetry/ext/http/server/http_server.h	66.67% <100.00%> (ø)
...clude/opentelemetry/ext/http/server/socket_tools.h	95.68% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[dbarker]

Looks good. Thanks