fix(ext/http): avoid misaligned sockaddr_in access in SocketAddr constructor

[Shubhammehta2008]

Fixes #4307

Changes

Avoids undefined behavior caused by binding a sockaddr_in & to m_data through reinterpret_cast in the SocketAddr(u_long, uint16_t) constructor.

Following the existing pattern in SocketAddr(char const *) and port(), this initializes a clean stack-allocated struct sockaddr_in and copies it into m_data using memcpy.

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

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: Shubhammehta2008 / name: shubham mehta (0f208c6)

[marcalff]

Thanks for the patch.

Please see comments, the proper fix is to use sockaddr_storage to represent a socket in an arbitrary protocol.

Other places using m_data may need some cleanup.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.53%. Comparing base (f77c1a5) to head (0f208c6).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4629      +/-   ##
==========================================
+ Coverage   86.53%   86.53%   +0.01%     
==========================================
  Files         525      525              
  Lines       20475    20476       +1     
==========================================
+ Hits        17715    17716       +1     
  Misses       2760     2760              

Files with missing lines	Coverage Δ
...clude/opentelemetry/ext/http/server/socket_tools.h	95.70% <100.00%> (+0.03%)	⬆️

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