foreachfield and staticschema cleanup

[piever]

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[codecov-io]

Codecov Report

Merging #121 into master will decrease coverage by 4.81%.
The diff coverage is 91.66%.

@@            Coverage Diff             @@
##           master     #121      +/-   ##
==========================================
- Coverage    94.5%   89.68%   -4.82%     
==========================================
  Files           9        9              
  Lines         400      378      -22     
==========================================
- Hits          378      339      -39     
- Misses         22       39      +17

Impacted Files	Coverage Δ
src/lazy.jl	96.29% <ø> (-3.71%)	⬇️
src/structarray.jl	85.41% <ø> (-6.59%)	⬇️
src/StructArrays.jl	100% <ø> (ø)	⬆️
src/utils.jl	92.45% <100%> (-0.77%)	⬇️
src/tables.jl	83.33% <83.33%> (-1.29%)	⬇️
src/interface.jl	83.33% <0%> (-16.67%)	⬇️
src/groupjoin.jl	83.33% <0%> (-7.58%)	⬇️
src/collect.jl	92.95% <0%> (-7.05%)	⬇️
... and 2 more

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