perf(lib/websockets): use Set to store listeners

[hasundue]

• chore(lib): add benchmark for LazyWebSocket
• perf(lib/websockets): use Set to store listeners

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.10%. Comparing base (23c7344) to head (b946cf7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #33      +/-   ##
==========================================
- Coverage   83.35%   83.10%   -0.25%     
==========================================
  Files          20       20              
  Lines         679      669      -10     
  Branches       41       39       -2     
==========================================
- Hits          566      556      -10     
  Misses        111      111              
  Partials        2        2              

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