fix: span handling in LR3

[josephschorr]

Iterators cannot use spans using the traditional defer span.End() as it will be called when the chained iterator is returned. Instead, we add a new cter function for wrapping other iterators

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.60%. Comparing base (798ae49) to head (fc97d8c).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2574      +/-   ##
==========================================
- Coverage   77.62%   77.60%   -0.02%     
==========================================
  Files         440      440              
  Lines       54067    54097      +30     
==========================================
+ Hits        41966    41975       +9     
- Misses       9481     9496      +15     
- Partials     2620     2626       +6     

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[tstirrat15]

Changes make sense to me. It does make me wonder how we'll instrument the new query library.