ref: Rewrite derive(ProcessValue) to use Structure::each_variant

[untitaker]

No description provided.

[codecov-io]

Codecov Report

Merging #175 into master will increase coverage by 0.09%.
The diff coverage is 93.33%.

@@            Coverage Diff            @@
##           master    #175      +/-   ##
=========================================
+ Coverage   64.41%   64.5%   +0.09%     
=========================================
  Files          82      83       +1     
  Lines        8913    8936      +23     
=========================================
+ Hits         5741    5764      +23     
  Misses       3172    3172

Impacted Files	Coverage Δ
general/src/types/value.rs	51.63% <ø> (ø)	⬆️
general/src/processor/traits.rs	100% <ø> (ø)	⬆️
general/src/protocol/request.rs	91.25% <ø> (ø)	⬆️
general/src/store/trimming.rs	92.27% <100%> (+0.02%)	⬆️
general/src/types/annotated.rs	78.69% <100%> (ø)	⬆️
general/tests/test_derive.rs	100% <100%> (ø)
general/src/processor/attrs.rs	71.94% <66.66%> (-0.39%)	⬇️
general/src/processor/impls.rs	92.72% <0%> (+3.63%)	⬆️

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