Enclose input_gate_lock_hold and input_gate_lock_wait spans into inpu…

[shrima-cf]

…t_gate_wait_attempt parent span

This will help group the lock and wait span from a single request together

I noticed from this span - https://tracing.cfdata.org/trace/000f2d35a668d2bb that the lock_wait and lock_holds are grouped individually, making it hard to tie the hold and wait to a single request. This change will help fix the issue.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.66%. Comparing base (a5c6178) to head (085419c).

Files with missing lines	Patch %	Lines
src/workerd/io/io-gate.c++	77.77%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5948      +/-   ##
==========================================
- Coverage   69.67%   69.66%   -0.01%     
==========================================
  Files         397      397              
  Lines      105999   106000       +1     
  Branches    17965    17965              
==========================================
- Hits        73853    73846       -7     
- Misses      21351    21358       +7     
- Partials    10795    10796       +1     

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