Optimize path start state

[rmisev]

This adds a fast path for URLs like ws://h, ws://h\ and ws://h/ that are parsed to ws://h/.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.67%. Comparing base (cc12906) to head (ed2b942).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #96   +/-   ##
=======================================
  Coverage   99.67%   99.67%           
=======================================
  Files          14       14           
  Lines        2454     2458    +4     
  Branches      389      390    +1     
=======================================
+ Hits         2446     2450    +4     
  Misses          8        8           

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