[processors] processor walker and display

[BohuTANG]

No description provided.

[codecov]

Codecov Report

Merging #84 (3f393f8) into master (a90741f) will decrease coverage by 0%.
The diff coverage is 70%.

@@          Coverage Diff           @@
##           master    #84    +/-   ##
======================================
- Coverage      84%    84%    -1%     
======================================
  Files         145    148     +3     
  Lines        6070   6203   +133     
======================================
+ Hits         5144   5234    +90     
- Misses        926    969    +43     

Impacted Files	Coverage Δ
src/processors/pipeline.rs	70% <0%> (-7%)	⬇️
src/processors/pipeline_builder.rs	82% <0%> (-2%)	⬇️
src/processors/processor_empty.rs	33% <0%> (-6%)	⬇️
src/transforms/transform_projection.rs	73% <0%> (-13%)	⬇️
src/transforms/transform_aggregator_final.rs	91% <50%> (-7%)	⬇️
src/transforms/transform_aggregator_partial.rs	89% <50%> (-6%)	⬇️
src/transforms/transform_filter.rs	82% <50%> (-6%)	⬇️
src/transforms/transform_limit.rs	83% <50%> (ø)
src/transforms/transform_source.rs	68% <50%> (-7%)	⬇️
src/processors/processor_merge.rs	76% <54%> (-8%)	⬇️
... and 12 more

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