Add sockets streams suite

[jasnell]

More test consolidations.

[ask-bonk]

I'm Bonk, and I've done a quick review of your PR.

Adds a dual-implementation socket-streams test suite with TCP echo sidecars.

1. Medium cancelReadableSettlesSocket does not exercise cancellation of a live read. Posted one inline suggestion to correct it.

Verification could not complete: Bazel lacks libc++ headers in this runner.

github run

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 37.33%. Comparing base (6637171) to head (31c33a2).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7180      +/-   ##
==========================================
- Coverage   37.56%   37.33%   -0.24%     
==========================================
  Files         801      801              
  Lines      253637   251822    -1815     
  Branches    20021    20021              
==========================================
- Hits        95286    94011    -1275     
+ Misses     146993   146453     -540     
  Partials    11358    11358              

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