airframe-sql: Add LogicalPlan.traverse

[xerial]

No description provided.

[codecov]

Codecov Report

Merging #2420 (d64c62f) into master (346ac97) will decrease coverage by 0.00%.
The diff coverage is 80.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2420      +/-   ##
==========================================
- Coverage   82.07%   82.07%   -0.01%     
==========================================
  Files         325      325              
  Lines       13389    13399      +10     
  Branches     2109     2087      -22     
==========================================
+ Hits        10989    10997       +8     
- Misses       2400     2402       +2     

Impacted Files	Coverage Δ
...n/scala/wvlet/airframe/sql/model/LogicalPlan.scala	82.82% <80.00%> (-0.19%)	⬇️
...frame-rx/src/main/scala/wvlet/airframe/rx/Rx.scala	83.95% <0.00%> (-1.24%)	⬇️
...rx/src/main/scala/wvlet/airframe/rx/RxRunner.scala	95.27% <0.00%> (+0.39%)	⬆️

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