Implement AnySocket for Socket

[raftario]

Pretty self-explanatory, lets you retrieve a Socket from a SocketSet without downcasting and handle that yourself.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.41%. Comparing base (39cd44e) to head (356b6be).

Files with missing lines	Patch %	Lines
src/socket/mod.rs	0.00%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1092      +/-   ##
==========================================
- Coverage   80.45%   80.41%   -0.05%     
==========================================
  Files          81       81              
  Lines       24461    24474      +13     
==========================================
  Hits        19681    19681              
- Misses       4780     4793      +13     

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